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The reuse of characters or items from a previous work in EasterEgg cameos in a newer one (similar to a fictional ProductionPosse or metafictional ContinuityCameo). In some cases, this lays down the basis of a [[TheVerse Verse]].

If it's something the actor did rather than the production team, it's an ActorAllusion. If the work in question is an unreleased earlier version of the same work, it's a DevelopmentGag. See also CompanyCrossReferences, which this trope often overlaps with.

When this is done for works that haven't yet been released, it's ProductionForeshadowing.

-----
!!Examples:
[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Manga/{{AKIRA}}'': In the manga, when the agent is hospitalized and being debriefed, the painting of the bed deliberately mimics the cover of one of Otomo's other works, ''Domu'', which shares themes with ''AKIRA'' and came out before Otomo started working on ''AKIRA''.
* ''Manga/NegimaMagisterNegiMagi'' is full of {{Shout Out}}s to Creator/KenAkamatsu's previous series, ''Manga/LoveHina''. Outside the numerous {{Expy}}s, Tama the turtle has a cameo, the famous [[MegatonPunch "Naru Punch"]] makes a reappearance, and one of Motoko's sword techniques sees some use in ''Negima''. In addition, several characters from ''Love Hina'' make reappearances in ''Negima''. The creator also [[WordOfGod confirmed]] that the hotel at which the characters stay in (one of) Negima's {{Beach Episode}}s is the same one where Naru and Keitaro stayed.
** Akamatsu also confirmed that Nitta-sensei is the same Nitta-sensei from his first series, ''Manga/AILoveYou''. Not to mention that Negima's BigBad Fate Averruncus is a rather obvious expy of Program Number 0.
* ''Manga/UQHolder'' also has {{Shout Out}}s to ''Manga/LoveHina''. There is a character named Shinobu with the same design as Love Hina's Shinobu. There is also a recreation of Keitarou's first visit to Hinata inn featuring Shinobu's first visit to Senkyokan inn.
* ''[[Manga/OoyasanWaShishunki Ooyasan wa Shishunki!]]'' features the cast of ''Manga/KomorisanCantDecline'' (the anime of which was also produced by Genco, a season before) in its seventh episode, among the crowd of students having soup. This mirrors how the cast of the former [[ProductionForeshadowing appeared]] in the latter.
* The ''Literature/EromangaSensei'' anime features multiple cameos from ''Literature/{{Oreimo}}'', since they both share the same authors. Episode 8 features Kuroneko and her sister as passerbys interviewed on TV, and another episode haves Kyosuke, Kirino, Kuroneko and Saori appear in the background.
* ''Anime/SwordArtOnlineOrdinalScale'' has the group go a Manga/{{Wagnaria}} branch, alluding to Creator/A1Pictures' lastest [[Manga/WWWWorking installment]] of the animated franchise the previous year.
* When Kaguya's class does a cosplay cafe for the culture festival in ''Manga/KaguyaSamaLoveIsWar'', one of her classmates is dressed up as [[Music/{{Vocaloid}} IA]] (who was designed by series author Aka Akasaka). There are also several references to the author's previous series ''ib: Instant Bullet'', like a character named Yume who dresses up as a witch and Fujiwara's Love Detective hat looking just like the one that Sera wore.
* ''Manga/MonthlyGirlsNozakiKun'' often makes references to the author's other concurrent work, ''Manga/OresamaTeacher''.
** Sakura's shelf in Episode 1 of the anime has a charm of Usa-chan from ''Ore-sama Teacher''.
** While Sakura is diligently "studying" shoujo manga (after being jealous by how well Rei and Nozaki got along with their shoujo manga conversations), she can be heard muttering various tropes--"Ore-sama", "age difference", "cat and dog relationship", and "childhood friends"--that perfectly describes Mafuyu and Takaomi of ''Ore-sama Teacher''.
* Episode 6 of ''Manga/InterviewsWithMonsterGirls'' has a scene where Takahashi explains to Himari that her sister is not just either a human or a vampire, but the sum of all her life experiences. This is shown with a scene of film reels coming together to form a picture of Hikari: said picture is identical to the cover of the manga's first volume.
* ''Manga/TalesOfWeddingRings'': In chapter 70, Morion is shown reading a volume of ''Manga/DuskMaidenOfAmnesia'', one of the creator Creator/{{Maybe}}'s earlier works.
[[/folder]]

[[folder:Asian Animation]]
* ''Animation/BhaagamBhaag'': Sunny owns a ''Animation/SimpleSamosa'' backpack, going back to Sanjiv Waeerkar's previous Disney Channel India show.
* In ''Animation/CatchTeenieping'', Romi's teacher, Dane, secretly likes playing with toys. Those toys? The ''Animation/{{Miniforce}}'' toyline, another Creator/{{SAMG}} cartoon.
* In ''Animation/PleasantGoatAndBigBigWolf: Great War in the Bizarre World'' episode 25, one of the merchants is selling plush toys of the characters from Huang Weiming's previous series, ''Animation/HappyFamily''.
[[/folder]]

[[folder:Fan Works]]
* The ''WesternAnimation/TurningRed'' fanfic ''Fanfic/FragileHandleWithCare'' makes reference to Soti-Kids, a children's medicine used in the author's previous fanfic, the ''VideoGame/PunchOut'' fanfic ''Fanfic/MaFille''.
* At one point in ''Fanfic/VowOfNudity'' (which [[LitRPG runs on 5th edition]] ''TabletopGame/DungeonsAndDragons'' rules), Kay'la goes back in time and finds the world running on 1st edition (OD&D) rules.
[[/folder]]

[[folder:Films -- Animation]]
* Disney does this quite a few times [[Franchise/DisneyAnimatedCanon within their films]]:
** Jose Carioca, who appeared in ''WesternAnimation/SaludosAmigos'', ''WesternAnimation/TheThreeCaballeros'' and ''WesternAnimation/MelodyTime'', cameos as a juror during Alice's trial in ''WesternAnimation/AliceInWonderland''.
** [[WesternAnimation/TheLittleMermaid1989 Sebastian]] is pulled out of a book Genie is flipping through in ''WesternAnimation/{{Aladdin}}'', a [[WesternAnimation/BeautyAndTheBeast Beast]] toy is also seen in the Sultan's collection, and Genie turns his head into WesternAnimation/{{Pinocchio}}'s.
** Both [[WesternAnimation/TheLionKing1994 Pumbaa]] and [[WesternAnimation/BeautyAndTheBeast Belle]] cameo in the background of France during the 'Out There' sequence of ''WesternAnimation/{{The Hunchback of Notre Dame|Disney}}''
** A tea set that looks remarkably similar to [[WesternAnimation/BeautyAndTheBeast Mrs. Potts]] appears in a quick shot of ''WesternAnimation/{{Tarzan}}''
** In ''WesternAnimation/{{Hercules}}'' Hercules wears a lion skin that looks like Scar from ''WesternAnimation/TheLionKing1994'', likely referencing the scene where Zazu snidely tells Mufasa that Scar "would make a very handsome throw rug."
** In ''WesternAnimation/{{Zootopia}}'', some the pirated movies Duke Weaselton is selling are animal versions of recent Disney animated hits: ''[[WesternAnimation/{{Tangled}} Wrangled]]'', ''[[WesternAnimation/WreckItRalph Wreck-It Rhino]]'', and ''[[WesternAnimation/BigHero6 Pig Hero 6]]''. He's also selling other Disney movies that are still in production, ''[[WesternAnimation/FrozenII Floatzen 2]]'', making it ProductionForeshadowing as well.
** In ''WesternAnimation/{{Moana}}'', one of the animals that shape-shifter Maui accidentally turns himself into is [[WesternAnimation/Frozen2013 Sven]].
** ''WesternAnimation/{{Frozen|2013}}'' gives us Rapunzel and Eugene briefly appearing in "For the First Time in Forever" among the guests filing over the bridge for Elsa's coronation.
* Creator/{{Pixar}} does this in [[http://jimhillmedia.com/blogs/jim_hill/archive/2007/12/09/a-special-where-s-wall-e-edition-of-why-for.aspx most, if not all, of its feature films]], usually with characters from its shorts:
** The lamp from Pixar's (canonically) "first" short, ''WesternAnimation/LuxoJr'' crushes the ''i'' in "Pixar" in the studio's standard VanityPlate.
** The ball from the same short likewise appears in pretty much every movie they ever make.
** Similarly, the Pizza Planet delivery van in every film since ''WesternAnimation/ToyStory1'', [[spoiler: even playing a major role in ''WesternAnimation/ToyStory2'''s climax]].
** The old man Geri from "Geri's Game" reappears as a toy repair man in ''WesternAnimation/ToyStory2''.
** Mike from ''WesternAnimation/MonstersInc1'' appears swimming during the credits of ''WesternAnimation/FindingNemo''.
** The logo for Buy n Large from ''WesternAnimation/WallE'' has made [[http://pixar.wikia.com/Buy_n_Large some appearances in later work]] as well (most notably, Buzz Lightyear's batteries in ''WesternAnimation/ToyStory3'').
** In ''WesternAnimation/TheIncredibles1'', the call-sign of Helen's plane is "India Golf Niner-Niner", or "IG-99", in reference to writer/director Creator/BradBird's previous film ''WesternAnimation/TheIronGiant'' (I.G.), which was released in 1999 (99).
[[/folder]]

[[folder:Films -- Live-Action]]
* Creator/GeorgeLucas films reuse the number 1138, after his debut feature, ''Film/THX1138'' (which was itself derived from his phone number when he made the original student film version). Due to Lucas' influence, other filmmakers get in on the act:
** Creator/MattDamon can be seen entering the last few digits of these numbers for the elevator access code in ''Film/OceansEleven''.
** It appears on a door in [[NoticeThis big, obvious numbers in a shot practically set up just to frame it]] in ''Film/SkyCaptainAndTheWorldOfTomorrow''.
* Creator/StanleyKubrick would re-insert "CRM 114" into his later movies, after the name of the plot-critical device in ''Film/DrStrangelove''. Other filmmakers get in on the act as well:
** Some sound equipment in the opening scene of ''Film/BackToTheFuture1''.
* Likewise, Creator/KevinSmith films reuse the number 37, after [[spoiler:the number of dicks Dante's girlfriend sucked]] in ''Film/{{Clerks}}''.
* The [[Series/{{Lost}} DHARMA Initiative]] logo appears at the beginning of Creator/JJAbrams' ''Film/{{Cloverfield}}''.
** The Hanso Foundation, DHARMA's financial backer, is mentioned in the credits of Abrams' ''Film/MissionImpossibleIII''.
** A DHARMA logo is also hidden in Abrams' ''Film/StarTrek2009''.
** An Oceanic Airlines advertisement appears in ''Series/{{Fringe}}'', another show by Creator/JJAbrams.
* Creator/QuentinTarantino:
** Big Kahuna Burger and Red Apple cigarettes
** The shared surname of the Vega brothers, [[Film/ReservoirDogs Vic]] and [[Film/PulpFiction Vincent]].
** Sheriff Earl [=McGraw=] from Tarantino's ''Film/FromDuskTillDawn'', ''Film/KillBill'' and both ''Film/{{Grindhouse}}'' movies.
** The DudeShesLikeInAComa rapist from ''Kill Bill'' re-appears as the guy with the car for the second half of Tarantino's later film ''Film/DeathProof''.
** Alabama from ''Film/TrueRomance'' gets fleetingly mentioned in ''Film/ReservoirDogs'' as Mr White's former partner in crime. It assumes Tarantino's original ending of ''True Romance.''
* Film/{{Machete}}, star of his own ([[{{Defictionalization}} no longer fictional]]) movie, shares the name, actor, and occupational field of a character from Creator/RobertRodriguez's ''Film/SpyKids'' and [[InNameOnly nothing else]].
* Composer [[Music/DireStraits Mark Knopfler]] said that he would write the music for ''Film/ThePrincessBride'' only if Rob Reiner worked the hat he wore as Marty [=DiBergi=] in ''Film/ThisIsSpinalTap'' into it. Although he couldn't get the exact same hat, a similar one appears among Fred Savage's things around the head of his bed. (Knopfler later replied he was joking about the refusal to work on the film.)
* The character Nobody from ''Film/DeadMan'' has a cameo in ''Film/GhostDogTheWayOfTheSamurai'' and says his catchphrase, "Stupid fucking white man!"
* ''Film/{{Made}}'', the SpiritualSuccessor to ''Film/{{Swingers}}'', includes a vanity license plate reading "[=DBLDN21=]." This is a reference to the scene in ''Swingers'' where Creator/VinceVaughn's character insists that you always double down on an 1l.
* ''Film/TheMatrixResurrections'' has small nods to Creator/TheWachowskis' previous work.
** A sign for ''Corky's Massage'' can briefly be seen. Corky was one of the leads of the sisters' first film, ''Film/{{Bound|1996}}''.
** A theater advertises a film starring Lito Rodriguez, an actor and one of the protagonists of ''Series/Sense8''.
* In ''Film/ThePostman'', Creator/KevinCostner threatens someone with a spoon, a reference to Creator/AlanRickman's famous line "CutHisHeartOutWithASpoon" from ''Film/RobinHoodPrinceOfThieves'' where Costner played Robin Hood.
* ''Film/SonicTheHedgehog2020'':
** Sonic is seen watching ''Gopher Broke'', a 2004 film that was director Jeff Fowler's first animated project.
** When Sonic takes the wheel of Tom's truck while they are being chased by Robotnik, he makes a ShoutOut to ''Film/TheFastAndTheFurious'', which producer Niel Moritz also worked on.
--->'''Sonic:''' I feel just like Creator/VinDiesel! "It's all about family, Tom!"
[[/folder]]

[[folder:Literature]]
* [[http://en.wikipedia.org/wiki/Vermicious_Knid Vermicious Knids]], which appear as antagonists in ''Literature/CharlieAndTheGreatGlassElevator'', get passing mentions as monsters in a handful of other Creator/RoaldDahl books written before and after it.
* ''Literature/{{Pale}}'' has a few references to the author's prior works:
** While Avery and Nora are Christmas shopping they make references to ''Literature/{{Worm}}'' and possibly ''Literature/{{Ward}}'' as a movie series. A jigsaw puzzle they pick out depicts a scene from ''Literature/{{Twig}}''.
** Snowdrop meets a Lost named [[Literature/{{Worm}} Fugly Bob]] on the Promenade.
[[/folder]]

[[folder:Live-Action TV]]
* In the ''Series/{{Community}}'' episode "[[Recap/CommunityS1E13InvestigativeJournalism Investigative Journalism]]" Creator/JackBlack played a character named "Buddy Austen", who shares a last name with Jack Austen, the main character in the unsold TV pilot ''Series/HeatVisionAndJack'' (created by by ''Community'' creator Creator/DanHarmon) also played by Jack Black. Also, [[spoiler:Owen Wilson, who voiced Heat Vision]], made a cameo appearance in the same episode.
[[/folder]]

[[folder:Music]]
* Music/DavidBowie:
** The music video for [[Music/LowDavidBowieAlbum "Be My Wife"]] recalls that for [[Music/HunkyDory "Life on Mars?"]] six years prior. Both videos feature Bowie in makeup, performing to the camera while alone in a WhiteVoidRoom.
** ''[[Music/HeroesDavidBowieAlbum "Heroes"]]'':
*** The cover art is partly a nod to Music/IggyPop's album ''Music/TheIdiot'' (which Bowie had produced and co-written a number of tracks on) from earlier in the year, right down to featuring the same photographer. The reference is more than fitting, as ''The Idiot'' was more or less a prelude to the Berlin Trilogy.
*** The title track features the synthesized train sounds that previously opened the title track to ''Music/StationToStation''.
*** The closing track "The Secret Life of Arabia" opens with the line "I was running at the speed of life," harking back to the opening track on ''[[Music/LowDavidBowieAlbum Low]]'', "Speed of Life".
** ''Music/ScaryMonstersAndSuperCreeps'':
*** The back cover references the covers of Bowie's "Berlin Trilogy": ''[[Music/LowDavidBowieAlbum Low]]'', ''[[Music/HeroesDavidBowieAlbum "Heroes"]]'' and ''Music/{{Lodger}}'', as well as the much earlier ''Music/AladdinSane''. Bowie's Pierrot getup on the front cover also harks back to the back cover of ''Music/SpaceOddity'', which featured a Pierrot leading away an old woman among the cavalcade of surreal imagery on the back cover; the ending of the "Ashes to Ashes" video recreates this, albeit with the roles reversed.
*** "Teenage Wildlife" prominently interpolates the TitleTrack to ''[[Music/HeroesDavidBowieAlbum "Heroes"]]''.
** ''Music/TheNextDay'' features copious amounts of it, partly because it was Bowie's first album since ''Music/{{Reality}}'' ten years prior, partly to tie in with the thematic ruminations on his advancing age (being 66 when the album released).
*** "Love is Lost" re-used puppets that had planned to be used for the filmed-but-unreleased ConceptVideo for [[Music/HoursDavidBowieAlbum "The Pretty Things Are Going to Hell"]]. The remix of the same song also samples the piano lick from [[Music/ScaryMonstersAndSuperCreeps "Ashes to Ashes"]].
*** The percussion on "Love is Lost" recreates the hollow drum sound that served as a crucial part of ''Music/{{Low|DavidBowieAlbum}}''[='s=] sonic aesthetic.
*** The lead single, "Where Are We Now?", references several UsefulNotes/{{Berlin}} landmarks (Potsdamer Platz, Nürnberger Straße, [=KaDeWe,=] etc.), nodding back to the trilogy of albums that Bowie recorded while residing in Berlin during the late '70s.
*** In the video for "The Stars (Are Out Tonight)", one of the new neighbors looks and sometimes dresses like [[Film/TheManWhoFellToEarth Thomas Jerome Newton]]/[[Music/StationToStation the Thin White Duke]] and the cover of one of the tabloid magazines uses Newton's alien form as [[http://cyoulateralligator.com/wp-content/uploads/2013/02/03-bowie-stars-are-out-tonight.jpg an image]] with the caption "Woman Goes To Oscars Without Makeup On".
*** The penultimate track, "You Feel So Lonely You Could Die", ends with the opening drums from [[Music/TheRiseAndFallOfZiggyStardustAndTheSpidersFromMars "Five Years"]].
*** The director of the videos for "The Stars (Are Out Tonight)" and "The Next Day" is Floria Sigismondi, who also did two of his ''Music/{{Earthling}}''-era videos: "Little Wonder" and "Dead Man Walking".
*** The cover is a modified version of the cover of ''[[Music/HeroesDavidBowieAlbum "Heroes"]]'', which has that album's title removed and a large portion of the picture of Bowie covered by a blank white square with this album's title on it.
** ''Music/BlackstarAlbum'':
*** In some parts of the music video for "Lazarus", Bowie wears a striped jumpsuit identical to the one he was pictured in on the back cover of the Creator/{{Rykodisc}} CD reissue of ''Music/StationToStation''.
*** The harmonica on the closing track "I Can't Give Everything Away" plays the same tune as the harmonica on "A New Career in a New Town" from Bowie's 1977 album ''Music/{{Low|DavidBowieAlbum}}''; fans have also cited similarities to "Music/NeverLetMeDown", "[[Music/TheRiseAndFallOfZiggyStardustAndTheSpidersFromMars Soul Love]]", and "[[Music/HoursDavidBowieAlbum Thursday's Child]]". The music also becomes more reminiscent of Bowie's old styles towards the end of the album.
* Music/PhilCollins: [[Music/FaceValue "In the Air Tonight"]] reuses the gated reverb drum sound previously heard on Music/PeterGabriel's "Intruder"; Collins had previously served as a session drummer on the song and [[Music/{{Melt}} its parent album]], and while "Intruder" is credited with inventing the drum sound, "In the Air Tonight" is widely considered the song that ''popularized'' it.
* Music/GeorgeHarrison's ''Music/AllThingsMustPass'' features a few:
** The first version of "Isn't It a Pity" reprises the ending melody of "[[Music/PastMasters Hey Jude]]" in a minor key, making it feel like a DarkReprise. It's also just a second shorter than the earlier song.
** "Ballad of Sir Frankie Crisp" makes a nod to "The Inner Light".
--->My eyes are shining, full of inner light
** The music video for "My Sweet Lord" (released in 2021) features a brief sequence where a man in the movie theater imitates Harrison's dance moves from the "dancing furniture" music video for "Got My Mind Set On You" (released in 1987), complete with a recreation of his leather chair.
* Music/KingCrimson:
** Several tracks on ''Music/InTheWakeOfPoseidon'' are written as direct counterparts to pieces from ''Music/InTheCourtOfTheCrimsonKing'' the previous year. "Pictures of a City" recalls "21st Century Schizoid Man", "Cadence and Cascade" nods back to "I Talk to the Wind", the TitleTrack homages "Epitaph", and "The Devil's Triangle" reprises the formatting of "Moonchild".
** ''Music/{{Beat}}'':
*** The album cover directly nods back to that of ''Music/{{Discipline}}'', replacing the Celtic knotwork with an eighth note.
*** "Neal and Jack and Me" reprises the technique used on both "Frame by Frame" and "Discipline" where Music/RobertFripp and Adrian Belew's guitars weave in and out of sync with one another.
*** The Frippertronics piece that forms the intro of "Neurotica" is directly lifted from "Hååden Two" off of Music/RobertFripp's debut solo album ''Exposure''.
* Music/MikeOldfield:
** [[Music/{{Crises}} "Foreign Affair"]] reprises the synth xylophone arpeggios from [[Music/FiveMilesOut "Mount Teidi"]].
** Multiple appear in ''Music/TubularBellsIII'', tying in with its celebration of the 25th anniversary of the original ''Music/TubularBells'':
*** Samples from many of Oldfield's prior albums feature throughout ''Tubular Bells III'': "Man in the Rain" features sampled drums from [[Music/{{Crises}} "Moonlight Shadow"]], "Outcast" features sampled drums from [[Music/{{Crises}} "Shadow on the Wall"]], and "Far Above the Clouds" features sampled drums from the end of "Ommadawn (Part One)". "Far Above the Clouds" also samples the rhythm guitar from the "Finale" section of "Tubular Bells (Part One)".
*** "Man in the Rain" repeats the structure of "Moonlight Shadow" from his 1983 album ''Music/{{Crises}}''; the song was first penned shortly after "Moonlight Shadow", which explains the similarities. The song also reprises elements of the TitleTrack to Oldfield's 1991 album ''Heaven's Open'', also an aftereffect of its prolonged development (as a 1987 demo of "Man in the Rain" was used as the basis for "Heaven's Open").
* A couple appear in Music/PinkFloyd's ''Music/TheFinalCut'':
** The line "Do you remember me? How we used to be?" in the chorus of "Your Possible Pasts" quotes the line "Do you remember me? How we used to be helpless and happy and blind?" in "Incarceration of a Flower Child", a song that Roger Waters wrote shortly after Music/SydBarrett's ousting but never released; the piece would ultimately be given to Music/MarianneFaithfull in 1999.
** During the outro of "Not Now John", Waters chants, "One, Two, Free, Four!", as a reference to the band's earlier single "Free Four" (from ''Music/ObscuredByClouds'').
* A couple appear in Music/ThePolice's ''Music/{{Synchronicity}}'':
** The mention of "Spiritus Mundi" in "Synchronicity I" nods back to "Spirits in the Material World" off of the band's previous album.
** The line "they say the meek shall inherit the Earth" in "Walking in Your Footsteps", in addition to being a ShoutOut to [[Literature/TheBible the Beatitudes]], recalls an identical line from the 1979 BSide "Visions of the Night" (included on "Walking on the Moon" in the UK and "Bring On the Night" in the US).
* Music/{{Queen|Band}}:
** The cover art for ''Music/{{A Day at the Races|Album}}'' is a redrawn version of that for ''Music/ANightAtTheOpera'' the previous year. Among other things, the white background is changed to black and the figures are in different poses (some more noticeable than others).
** Appears frequently throughout ''Music/MadeInHeaven'', tying in with that album's nature as the band's GrandFinale following the death of frontman Music/FreddieMercury four years prior.
*** "Mother Love" samples Freddie Mercury's call-and-response chant from the band's 1986 Wembley Stadium concert (as documented in the 1992 LiveAlbum ''Live at Wembley '86''), with the synth string intro to [[Music/AKindOfMagic "One Vision"]] playing in the background. The last lines of the song are additionally lifted from Mercury's 1973 solo cover of [[Music/DustySpringfield "Goin' Back"]], which was included as the B-side to Mercury's debut solo single (released under the pseudonym Larry Lurex), a rendition of the Ronettes' "I Can Hear Music".
*** "I Was Born to Love You" samples Mercury's ad-libs from the TitleTrack to ''Music/AKindOfMagic''.
*** "A Winter's Tale", recorded during the post-''Innuendo'' sessions, has a subtle but charming one: "It's ''Music/{{a kind of magic}}'' in the air".
*** The breakdown in "It's a Beautiful Day (Reprise)" samples the piano riff from the closing track of both ''Music/{{Queen|1973}}'' and ''Music/QueenII'', "Seven Seas of Rhye".
*** Mercury's interjection of "yeah!" in both "It's a Beautiful Day (Reprise)" and the aptly-titled "Yeah" is sampled from [[Music/HotSpace "Action This Day"]]
* Music/{{REM}}:
** The interjection of "gentlemen, testify!" in [[Music/FablesOfTheReconstruction "Cant Get There from Here"]] nods back to the band's cover of "Tighten Up" by Archie Bell & the Drells (which features several yelps of "testify!" throughout and its own "gentlemen, testify!" at the end), tying in with the former song's {{soul}} influences.
** ''Music/{{Green}}'':
*** "Pop Song 89" reprises the lead riff of "Feeling Gravitys Pull" off of ''Music/FablesOfTheReconstruction'', albeit in a major key and faster-paced this time around.
*** "Turn You Inside-Out" is more or less a remake of "Finest Worksong" off of ''Music/{{Document}}'', just with the chord progression reversed; the lyrics also act as a thematic continuation.
** ''Music/AutomaticForThePeople'':
*** Mike Mills and Bill Berry's backing vocals on "Find the River" hark back to a similar technique on [[Music/{{Reckoning}} "Harborcoat"]] nearly a decade prior, a similarity that Mills confirmed to be an intentional creative decision in an interview with ''Melody Maker''.
*** The verses of "Try Not to Breathe" reprise the melody and rhythm of [[Music/LifesRichPageant "Swan Swan H"]].
** ''Music/{{Accelerate}}'':
*** "Sing for the Submarine" name-checks [[Music/FablesofTheReconstruction "Feeling Gravitys Pull"]], [[Music/{{Document}} "It's the End of the World as We Know It (And I Feel Fine)"]], and ''Music/AroundTheSun''[='s=] "Electron Blue" and "High-Speed Train". The song also quotes phrases from [[Music/{{Green}} "You Are the Everything", "World Leader Pretend"]], [[Music/LifesRichPageant "Begin the Begin"]], [[Music/{{Reveal}} "Beat a Drum", "I'll Take the Rain"]], and [[Music/OutOfTime "Losing My Religion"]].
*** The TitleTrack mentions a "cartoon escape hatch" in its chorus, nodding back to the use of "cartoon" as an {{arc word|s}} on ''Music/{{Monster|REMAlbum}}'' (itself a similarly loud and distorted-sounding album). The same song reprises melodic elements of the ''Monster'' track "Circus Envy", especially in the choruses.
*** "Horse to Water" features the lines "Bantamweight with a mouth full of feathers/Don't you know that what comes around goes around," nodding back to the similar lines "I say that I'm a bantam lightweight/I say that I'm a phantom airplane/That never left the ground" in [[Music/NewAdventuresInHiFi "Leave"]].
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/MagicTheGathering'''s ''Time Spiral'' set, of its ''Time Spiral'' block, references several early cards (as well as having an entire "timeshifted" block of old cards). The block's other two sets, ''Planar Chaos'' and ''Future Sight,'' contain WhatCouldHaveBeen and ProductionForeshadowing, respectively.
[[/folder]]

[[folder:Theme Parks]]
* Disney has practically made an art form of this in [[Ride/DisneyThemeParks their theme parks]]. If a ride is remade, expect some reference to the original to be present somewhere in the new version, typically in the queue area. It would actually be easier to list the rides that DON'T follow this trope. Some notable examples:
** In the most recent incarnation of the Imagination ride (''Journey into Imagination with Figment''), one of the offices in the Imagination Institute Sense Lab belongs to one "Dean Finder", a call-back to [[EnsembleDarkhorse Dreamfinder]] from the original version of the ride.
** In ''Test Track'', the emblem to the pavilion's original ride, ''World of Motion'', is visible in the queue.
** In the Magic Kingdom version of ''The Many Adventures of Winnie the Pooh'', various references to the site's former occupant, ''Mr. Toad's Wild Ride''. These include pictures in Owl's house of Mr. Toad handing Owl the deed to Toad Hall, and of Pooh meeting Moley. A statue of Toad was also placed in the pet cemetery outside of the Haunted Mansion.
*** Similarly, Disneyland's version of the attraction made a nod to its previous occupant, the Country Bear Playhouse, by featuring the heads of Max, Huff, and Melvin mounted on a wall.
** In the new version of ''Ride/StarTours'', the previous version's host, REX, can be seen in a crate bound for his home factory (with a "DEFECTIVE" label stamped on it).
** Horizons was a dark ride that ran in Epcot's Future World from 1982 to 1999. It was torn down then, and replaced in 2003 with Mission: SPACE. The center of the gravity wheel in Mission: SPACE's queue has the Horizons logo, and a stylized version also appears on the front of the checkout counter in the Cargo Bay gift shop at the exit to the attraction.
*** The post-show for Space Mountain in the Magic Kingdom received several tributes to Horizons following a 2009 refurbishment.
* Ride/UniversalStudios also does this from time to time. Most notably they paid homage to the now-defunct "Ride/BackToTheFutureTheRide" by including a reference to a (bankrupt) Dr. Brown in the queue for the ride that replaced it, "The Simpsons Ride".
[[/folder]]

[[folder:Video Games]]
* A solid third of ''VideoGame/TheBindingOfIsaac'' features characters from Ed [=McMillen=]'s other games. Meatboy of ''Super VideoGame/MeatBoy'' fame shows up as an item (he's a familiar that'll follow you around and munch on your enemies) and several other SMB characters show up as either items or bosses. ''VideoGame/{{Gish}}'' shows up as a boss and related drop, Steve from ''VideoGame/TimeFcuk'' likewise, and even the obscure ''Triachnid'' has been made into a boss.
* Chapter 7 of ''VideoGame/{{Celeste}}'' is one big throwback to the original freeware version of the game. Madeline ditches her backpack, making her look more like the player sprite from the freeware version, and her hair changes color [[PowerDyesYourHair as she gains a second air dash]] [[spoiler: as a result of her EnemyWithout finally agreeing to merge with her and help her climb back up the mountain after knocking her off]], an ability that you get partway through the freeware version. Also like the freeware version, the game starts measuring how high up you are in meters after finishing each part of the chapter.
* ''VideoGame/ChicoryAColorfulTale'':
** In the "Teatime Meadows" area, there's a bird named Kiwi that's dressed exactly like the ''VideoGame/{{Wandersong}}'' protagonist (who's also called Kiwi by the devs), who asks that you help make music using said game's directional mechanic. As a reward, you're given a brush style that lets you stamp music notes on the environment.
** Additionally, [[spoiler:one of the final boss' attack patterns is the falling feathers from ''VideoGame/{{Celeste}}''.]]
* The ''VideoGame/CrashBandicootNSaneTrilogy'', made by Vicarious Visions as a remake of the original Naughty Dog trilogy, contains a musical reference to the VV-made ''VideoGame/CrashBandicoot2NTranced'' in the fight with Dr. Nefarious Tropy in the remake of the third game. Near the beginning of his battle theme, three repeating notes get emphasized more than in the original - the same notes that were repeated throughout most of Tropy's battle theme in ''N-Tranced''.
* The arcade version of ''VideoGame/DoubleDragon'' features the red sports car from Data East's ''VideoGame/RoadBlaster'' inside Billy and Jimmy's garage, as well as a billboard advertising ''[[VideoGame/KunioKun Nekketsu Koha Kunio-kun]]'' (the Japanese version of ''Renegade'') just before the first boss battle. Both were games previously directed by Yoshihisa Kishimoto, the director of ''Double Dragon''. In the arcade version of ''Double Dragon II'', the helicopter from ''Cobra Command'' (Kishimoto's other FMV game he did for Data East) appears in the garage at the beginning as well.
** The [=WayForward=]-developed ''VideoGame/RiverCityGirls'' has a reversed situation by incorporating various ''VideoGame/DoubleDragon'' characters owned by Arc System Works, most notably the Lee brothers, Marian and Abobo, who are all clearly the ''[[VideoGame/DoubleDragonNeon Neon]]'' incarnations of them since [=WayForward=] developed that game. [[spoiler:It even includes an appearance by its main villain Skullmageddon, still voiced by that game's director Sean Velasco.]]
* It's common practice to reuse musical themes and legendary weapon names in ''VideoGame/FireEmblem'' in later installments in new contexts.
** Battle and boss themes from games early in the series [[https://www.youtube.com/watch?v=01s1xmX3lyM reappear three or four games later as various arena, boss or fight themes]].
** Legendary weapons also get reused, sometimes as [[LegendaryWeapon the same weapon used by heroes in ages past]] and other times by inexplicably [[NamedWeapons sharing a name]] with the weapons of another world's heroes. The three Regalia Weapons in the first game, ''VideoGame/FireEmblemShadowDragonAndTheBladeOfLight'' originate from another continent hundreds of years prior in ''VideoGame/FireEmblemGenealogyOfTheHolyWar'' and endure for thousands of years into ''VideoGame/FireEmblemAwakening.'' However, legendary weapons of the same names also appear in ''VideoGame/FireEmblemThreeHouses,'' being used in heroic battles of the past, only to resurface in the modern day [[ExcaliburInTheRust rusted out and embedded in the flesh of monsters.]]
* Creator/TobyFox has included remixes of his song "Megalovania" in various projects of his, most notably video games. First appearing as the final boss theme for ''VideoGame/TheHalloweenHack'', it later appeared in ''Webcomic/{{Homestuck}}'' (which he contributed music to), and its latest appearance being ''VideoGame/{{Undertale}}'', where it plays during the boss fight with [[spoiler: Sans, during the Genocide route.]] ''Undertale'', particularly the endings and final bosses of its multiple routes, contains plenty of references to ''The Halloween Hack'', including [[spoiler:the Game Over screen during the Flowey boss fight being similar to Dr. Andonuts's, Sans claiming he's simply leaving when you mortally wound him being exactly what Andonuts did, and the final set of minibosses being called Amalgamates]].
* ''VideoGame/KingdomHeartsIII'':
** While the game largely cut back on Square-Enix characters beyond the Moogles, one notable exception was made. As the devs for the Gummi sections were from the team that made ''VideoGame/{{Einhander}}'', that game's penultimate boss, Schwartzgeist, makes a return as the Gummi superboss, complete with its ClippedWingAngel form Monitor and a remix of [[BattleThemeMusic Thermosphere]]. As an EasterEgg, [[spoiler:if you find the hidden Endymion blueprint and fight Schwartzgeist with it, the original version of Thermosphere plays instead.]]
** The GameWithinAGame ''Verum Rex'' is a pretty blatant knockoff of ''VideoGame/FinalFantasyXV'', of which ''Kingdom Hearts'' series director Creator/TetsuyaNomura was working on when it was still known as ''Final Fantasy Versus XIII''. The main character is even named "Yozora", whose meaning is identical to "Noctis", "night sky". [[spoiler:The endings of both the main game and ''Re Mind'' double down on the ''Versus XIII'' references, with the Secret Ending track "Secrets of the Night" having a MusicalNod to "Somnus" (both composed by Yoko Shimomura) and the Limitcut Episode ending being an almost-perfect shot-for-shot recreation of the opening of ''Versus XIII''[='s=] 2011 trailer.]]
* Before creating ''VideoGame/KingdomOfLoathing'', Team Asymmetric created a game called Krakrox the Barbarian. At least one item from that game appears in Kol, the Ring of Half-Assed Regeneration.
** And there's also [[http://kol.coldfront.net/thekolwiki/index.php/Empty_agua_de_vida_bottle an item]] that lets you play ''as'' Krakrox for a few adventures.
** And now Krakrox's Loincloth, "originally owned by the famous barbarian adventurer Krakrox," is part of the Seal Clubber's Legendary Regalia.
* Creator/HideoKojima has a habit of inserting references to his previous works in his newer works, beginning with ''VisualNovel/{{Snatcher}}'', which included references to ''VideoGame/MetalGear'' (such as Gillian's robotic companion modeled after the Metal Gear mecha), and then with ''VideoGame/MetalGear2SolidSnake'' (which referenced the Snatcher Project and canonized Dr. Pettrovich's surname as "Madnar"), ''VisualNovel/{{Policenauts}}'' (which included plenty of ''Metal Gear'' and ''Snatcher'' references), and the ''VisualNovel/TokimekiMemorial Drama Series'' (which included several ''Policenauts'' and ''Metal Gear Solid'' references). The most popular example is the {{transplant}} of Meryl Silverburgh, originally a ''Policenauts'' character, into ''VideoGame/MetalGearSolid''.
** According to the artbook, Snake's long hair in the briefing sequence in ''VideoGame/MetalGearSolid'' is supposed to be the same hairstyle as Jonathan from ''VisualNovel/{{Policenauts}}''. His ImportantHaircut is a joke signaling to the player that they should forget about ''Policenauts'', because it's time for ''Metal Gear Solid'' now.
** There was a strange RunningGag across Metal Gear's non-canonical stories with the mention of someone called "Dr. Koppelthorn". Mei Ling tries to quote this person in ''VideoGame/MetalGearGhostBabel'' but is always cut off by Snake, and they're mentioned again in the same game in the ShowWithinAShow "[=IdeaSpy=] 2.5". Then, in External Gazer (one of the bonus stories in [[VideoGame/MetalGearSolid2SonsOfLiberty MGS2]]: [[UpdatedRerelease Substance]]), a device called the Koppelthorn engine kickstarts the plot. Finally, VideoGame/MetalGearAcid2 introduced a Doctor Thomas Koppelthorn as a prominent character and one of the main antagonists.
* The movie-themed floor in ''VideoGame/LuigisMansion3'' has a gallery of pictures referencing games that its developer Creator/NextLevelGames has previously worked on, including [[VideoGame/PunchOut one of Little Mac]] and [[VideoGame/SuperMarioStrikers Mario kicking a ball]].
* As mentioned on the ProductionForeshadowing page, ''VideoGame/{{Madworld}}'' has an ad in the subway for The Gates of Hell, the bar from ''VideoGame/{{Bayonetta}}'', which was still in development at that time. Then, in ''Bayonetta'', ''Madworld'' receives a CallBack, at The Gates of Hell coincidentally.
--> '''Rodin''': No matter how much you ask, I'm not strapping a chainsaw to your arm. [[note]]''Madworld'''s protagonist, Jack, has a chainsaw attached to his arm.[[/note]]
* Creator/MasahiroSakurai was the man responsible for both ''Franchise/{{Kirby}}'' and ''VideoGame/SuperSmashBros'', and both franchises have referenced each other from the start. Master Hand, the traditional FinalBoss of the latter series, was based on Wham Bam Rock from ''VideoGame/KirbySuperStar'', and even appeared alongside Crazy Hand from ''Melee'' in ''VideoGame/KirbyAndTheAmazingMirror'' as the ninth boss. The remake of ''Super Star'', acknowledging the roots of Master Hand, made Wham Bam Rock a TrickBoss in one of the new modes while introducing Wham Bam Jewel, a nod to Crazy Hand.
* ''VideoGame/NobodySavesTheWorld'': After Randy accuses the protagonist of stealing Nostramagus's wand, one guard checkpoint will be lined with {{Wanted Poster}}s for their "Nobody" form... and one for Flame Face from ''VideoGame/{{Guacamelee}}'', the creators' previous project. One of the random soda machines also advertises a drink called "Guava Melee" with a picture of Juan Aguacate, the protagonist of ''VideoGame/{{Guacamelee}}''.
* Telltale's first game, ''[[VideoGame/TelltaleTexasHoldEm Telltale Texas Hold'Em]]'' featured a mustached character named "Boris Krinkle", in which one possible line of dialogue has the character of Grandma telling him that he looks more like a 'Leonard Steakcharmer'." Naturally, when you first meet Leonard, sans mustache, in Telltale's ''[[VideoGame/SamAndMaxFreelancePolice Sam & Max]]'' episode ''The Mole, The Mob, and The Meatball'', you get the option to say he looks more like a Boris Krinkle.
* ''VideoGame/YookaLayleeAndTheImpossibleLair'' makes use of a remix of "Jungle Challenge", a music track originally made for the ''VideoGame/YookaLaylee'' kickstarter pitch but never added to the actual game, as its menu theme.
[[/folder]]

[[folder:Webcomics]]
* ''Webcomic/AHeartfeltAndante'': An ad for the author's prior webcomic, ''Webcomic/WhaleStarTheGyeongseongMermaid'', is briefly seen as Da-ul browses the internet in the first chapter.
* ''Webcomic/MSPaintAdventures'' has jokes from earlier adventures in the same series as well as [[MythologyGag unrelated old webcomics by the same author]]. Thus, in ''Webcomic/{{Homestuck}}'', you have allusions to pumpkins disappearing and retrieval of arms from the author's first experiments with the format. Much later on, a plot development where one character is thrown in jail is clearly imitating the style of ''Webcomic/{{Jailbreak}}'', the first comic on the MSPA website.
[[/folder]]

[[folder:Web Original]]
* Occasionally done during ''Podcast/EscapeFromVaultDisney'' in reference to ''WebVideo/SomeJerkWithACamera'' episodes and other videos on Tony's Website/YouTube channel:
** When they are disgusted at Creator/SandraBullock's character dipping an Oreo in milk her cat just drank in ''Film/WhileYouWereSleeping'', Kit speculates this is where the cat flu from ''Film/EscapeFromTomorrow'' started, something that was frequently mocked in Tony's review of the latter film.
** In the podcast discussing the Lesley Ann Warren episode of ''Series/TheMuppetShow'', Tony says that since the episode contains a segment with a ballet based on ''Literature/BeautyAndTheBeast'', he'll probably have to co-review it with [[WebVideo/BrowsHeldHigh Kyle Kallgren]] someday.
** In the ''[[Series/HighSchoolMusicalTheMusicalTheSeries High School Musical: The Musical: The Holiday Special]]'' episode, Chris wonders why this disposable special is on Disney Plus instead of the many better things that could be, leading to a reference to a recurring bit in Tony's "Top 15 Attractions That Closed in 2017 (And the First Couple Months of 2018)" ''State of the Parks'' video.
-->'''Tony:''' Well, what's the point in removing it?
-->'''Chris:''' Well, in theme park terms, they had nothing to replace it with.
** Tony describes the escape scene on the Death Star in ''Film/ANewHope'' as when "Luke lassos that thing, and the princess kisses him and they swing off together", a reference to [[https://www.youtube.com/watch?v=sl8ATtghZ_Q this 70's commercial]] that was used in a couple of Tony's ''Franchise/StarWars''-related vlogs to show how much discourse around the franchise has changed since the original movie's debut.
* Anders Sandberg, one of the big contributors to ''Website/OrionsArm'' has worked on several rpgs in the past, including BigIdeasGrandVision. Every human colony from this game has been transplanted into ''Orion's Arm'', after being suitably altered to fit in with the new setting.
* Artist Creator/UrsulaVernon created a line of fake merchandise for the non-existent Red Wombat Tea Company ("We dig tea"). In her podcast ''Podcast/TheHiddenAlmanac'', Red Wombat Tea Company is said to be the Almanac's major sponsor.
[[/folder]]

[[folder:Western Animation]]
* In ''WesternAnimation/TheSimpsons'', characters from Matt Groening's ''ComicStrip/LifeInHell'' comic strip (usually Bongo) sometimes appear as stuffed toys.
** In the [[VideoGame/TheSimpsons early 1990s ''Simpsons'' arcade game]], they appeared as enemies in the DreamLand level (as well as every interstitial title screen).
** In ''WesternAnimation/{{Futurama}}'', Bongo appears in a pet shop.
* ''WesternAnimation/{{Sintel}}'' features characters from the Blender Foundation's two previous shorts. In the market scene, you can clearly see Proog from ''WesternAnimation/ElephantsDream'', and the butterflies in the bamboo forest are just a PaletteSwap of the ones from ''WesternAnimation/BigBuckBunny''.
* The ''WesternAnimation/PoundPuppies2010'' episode "Olaf in Love" uses the instrumental of the "Cutie Mark Crusaders Song" from the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode [[Recap/MyLittlePonyFriendshipIsMagicS1E18TheShowStoppers "The Show Stoppers"]].
** And considering who created the show, one episode has Olaf suggesting they give out flyers to [[WesternAnimation/{{Recess}} Third Street School]].
* The film grain effect of the title sequence of ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' hides this, but the gravestones are inscribed with the names of three fellow Creator/CartoonNetwork series (''WesternAnimation/EvilConCarne'', ''WesternAnimation/TimeSquad'', and ''WesternAnimation/WhateverHappenedToRobotJones''), all of which were cancelled during the production of the show's first solo season.
* ''WesternAnimation/Dougs1stMovie'' used background music from another Jumbo Pictures show, ''WesternAnimation/OneHundredAndOneDalmatiansTheSeries''. (Note: ''Doug'' came before ''Dalmatians'', but the movie came out after ''Dalmatians'' ended)
* ''WesternAnimation/ChalkZone'' would frequently use background music cues from the original ''WesternAnimation/OhYeahCartoons'' shorts of ''WesternAnimation/TheFairlyOddParents''. Note that both shows were produced by the same studio, spun-off from ''Oh Yeah! Cartoons'', and both were/are composed by Guy Moon. Later ''[=ChalkZone=]'' episodes would sometimes use background music cues from earlier episodes of ''[=OddParents=]''.
* Similarly, ''WesternAnimation/PhineasAndFerb'' takes numerous background cues from other Disney shows scored by Danny Jacob as well as instrumental versions of songs such as Aloha Oe from ''WesternAnimation/LeroyAndStitch'' and Kronk for Hire from ''WesternAnimation/TheEmperorsNewSchool''.
** The latter show used an instrumental version of a song from ''WesternAnimation/YinYangYo''.
** Sister series ''WesternAnimation/MiloMurphysLaw'' takes instrumental versions of songs from ''Phineas & Ferb''.
* ''WesternAnimation/FrankeldasBookOfSpooks'' features the cubist styled axolotls from Cinema Fantasma's short film ''Revoltoso'' in its third episode.
* ''WesternAnimation/OKKOLetsBeHeroes'' takes many of its sound effects and some background music from old Creator/HannaBarbera cartoons, with that studio being the spiritual predecessor to Creator/CartoonNetwork's own production house. This is especially evident in the VanityPlate, as [[https://www.youtube.com/watch?v=WLwcPxi4ODo the style and music used]] is a direct reference to the [[https://youtu.be/x_xGRSfz7nA?t=7m45s Hanna-Barbera vanity plates]] used by early Cartoon Network productions.
* ''WesternAnimation/ReadyJetGo'' uses a lot of ''WesternAnimation/HeyArnold'' stings and sound effects. In fact, one recurring character, Lillian, resembles a character seen in one of Creator/CraigBartlett's claymation shorts he made for ''Series/SesameStreet''.
* One episode of ''WesternAnimation/ReBoot'' has a cameo from the handyman characters from the music video of "Money For Nothing" by Music/DireStraits, a music video the creators of ReBoot had worked on before forming the studio that produced the show.
* The skull logo seen on Duncan's shirt in ''WesternAnimation/TotalDrama'' has also appeared on Corey Riffin's hat in ''WesternAnimation/{{Grojband}}'', Eric Needles' shirt on ''WesternAnimation/{{Sidekick}}'', and the shirt of Jesse, TheBully from ''WesternAnimation/{{Looped}}'' -- all series that have Todd Kauffman as a producer on.

[[/folder]]
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