!!{{Trivia}} tropes pertaining to ''WesternAnimation/AdventureTime'':
* ActorAllusion: This is Creator/JohnDiMaggio's [[WesternAnimation/AmericanDragonJakeLong second time voicing a magical talking dog.]] Many more instances occur in individual episodes, specifically when he talks about his history of [[WesternAnimation/{{Futurama}} stealing purses and being a friend to a human in a strange, futuristic world]].
** "The Red Throne" features characters voiced by Creator/KeithDavid and Wrestling/RoddyPiper engage in a [[Film/TheyLive long, random fist fight]].
** In "Lady and Peebles", Princess Bubblegum [[spoiler:fights Ricardio, a villain who's essentially a living heart]]. It wouldn't be the first time a Creator/HyndenWalch-voiced character has ever [[WesternAnimation/TeenTitans done that]].
*** In the Japanese dub, it's not the first time Creator/RieTanaka voice a girl from noble origins [[Anime/MobileSuitGundamSEED with]] [[Anime/MobileSuitGundamSEEDDestiny pink hair]].
** Also from "Lady & Peebles", [[Creator/GeorgeTakei Ricardio]] says this line:
--->"Ohhh, myyy…"
** In "Memories of Boom-Boom Mountain", the Head Marauder (played by Tom Wilson) [[Film/BackToTheFuture calls Finn a chicken]], and Finn angrily responds "What did you call me?"
** In "Candy Streets", Pete plays another Pete in the {{Disney}} line up.
** Dana Snyder plays a wizard whose magic grants life to inanimate objects which then go on to terrorize others. Believe it or not, that's a regular motif on ''WesternAnimation/AquaTeenHungerForce''.
*** Oh, and he's also a MommasBoy like [[WesternAnimation/{{Chowder}} Gazpacho]] and [[CodeMonkeys Todd]].
** Johnathan "[[Series/StarTrekTheNextGeneration Will Riker]]" Franks provides the voice of an adult Finn in an episode that has a striking similarity to the beloved TNG episode, ''[[Recap/StarTrekTheNextGenerationS5E25TheInnerLight The Inner Light]]''.
** The Lich, voiced by Creator/RonPerlman, in regards to Film/{{Hellboy}}. He's [[ApocalypseMaiden supposed to cause the end of the universe,]] his horns are broken [[RedRightHand (albeit only one of them)]], [[spoiler:but [[AntiAntiChrist the becomes altered from that cause]] around the time [[RaiseHimRightThisTime he gets adopted.]]]]
** Shoko's WeaponOfChoice is a knife, much like IsabelleFuhrman's two most [[Film/{{Orphan}} famous]] [[Film/TheHungerGames roles]].
* ActorSharedBackground: Creator/HyndenWalch and Princess Bubblegum have both learned to speak fluent German.
* AdoredByTheNetwork: The show is this. Heck, one might even say it saved the network (since, prior to this show, the channel ''was'' going downhill, thanks to the classic cartoons being moved to Boomerang, the Cartoon Cartoons ending/getting cancelled, the push for more live-action shows [which, for a channel dedicated to animated shows, was a very stupid idea], and behind-the-scenes politics and double-dealings)! Very much adored along with ''WesternAnimation/RegularShow'' and, to a lesser extent, ''WesternAnimation/TheAmazingWorldOfGumball''. Name any other Creator/CartoonNetwork show, before or since, that's gotten as much hype, as much merchandising, or as much publicity as this one.
* AllStarCast: Let's see, in various episodes we have [[Music/ChildishGambino Donald Glover]], [[Music/TheLonelyIsland Andy Samberg]], Creator/JohnDiMaggio, Creator/JonathanFrakes, Creator/LevarBurton, [[Film/MyDinnerWithAndre Wallace]] [[Film/ThePrincessBride Shawn,]] [[Series/TheAndyMilonakisShow Andy Milonakis,]] Creator/GeorgeTakei, and Creator/NeilPatrickHarris.
* AluminumChristmasTrees: In "We Fixed a Truck", Starchy claims that Princess Bubblegum is actually a reptilian shapeshifter. There are people who actually believe that [[http://en.wikipedia.org/wiki/Reptilians world leaders are shapeshifting alien lizards]].
* ApprovalOfGod: Pen pretty much loves all works made by fans, simply because he appreciates that they care enough about the show to do them. [[http://twitter.com/buenothebear/status/154666845822132224 There are some works that he even praises over his Twitter.]]
* AscendedFanon: The idea that there were [[http://www.formspring.me/MrMuto/q/208804101197172871 cat/monochromicorn wars]]. And of ''course'', some fans put it on the "official" wiki.
** One fan made a drawing of a tiny cat assassin named Me-Mow. The creators liked the idea, and thus, the episode "Jake vs. Me-Mow" was born.
** Sort of. Liz Prince wrote a 7-page story called "Fruit Salad Days" for Marceline and the Scream Queens Issue 3, in which Lemongrab was the frontman of a punk rock band called "Unacceptable." Liz Prince's idea of Lemongrab having a punk band named Unacceptable was actually re-used for an official Adventure Time game and comics the following year.
** Finn's 13th birthday episode first aired, coincidentally, on Pi Day (March 14, 2011) which first {{Fanon}} and later WordOfGod made his birthday.
* BadExportForYou: The Cartoon Network Australia version of ''Adventure Time'' has a ''truckload'' of stuff cut out due to censorship, making a lot of episodes look and sound choppy and incomprehensible...
** BannedInChina: ...and episodes that aren't butchered are merely pulled from rotation (such as "Fionna and Cake" and "What Was Missing" due to many scenes deemed too sexually suggestive). Thankfully, when the series appeared on free-to-air it was screened unedited (though a few episodes were out of order).
* {{Blooper}}:
** In "Storytelling" Finn says "aminals" instead of "animals", although given the ''Adventure Time'''s use of odd slang and particularly Finn's fondness for blurting out his own nonsensical versions of words and combinations of words this mispronunciation may be intentional.
** In "The Limit" Jake says he can't blink... and then blinks mere seconds later.
** They forgot to put the snail in "Trouble in Lumpy Space" and "Blood under the Skin".
** In "Business Time", they misspell Finn's name as "Fin".
** In "You Made Me!", Lemongrab's shoes randomly disappear when he takes out the Sound Sword for the first time.
* CashCowFranchise: On top of the things listed on the [[Franchise/AdventureTime franchise page]], it also has various toy and clothing merchandises with more still to come.
* ChannelHop: The pilot was created for and aired on Creator/{{Nickelodeon}}'s ''Random Cartoons''.
* CreatorBacklash: [[http://www.formspring.me/natazilla/q/288568498802666906 Natasha really hated the design of Ghost Princess.]]
** Pen doesn't really like Tiffany very much and is perfectly content with him never returning again. [[spoiler:This, however, didn't stop him from returning in "One Last Job."]]
** [[http://24.media.tumblr.com/dd893886a91adef37cab606a39186365/tumblr_mwnfljXRs51r74fx2o1_500.png Pen]][[http://24.media.tumblr.com/929c9fe944e26693fde56465b387892f/tumblr_mwnfljXRs51r74fx2o2_500.png also]][[http://31.media.tumblr.com/3155b7ce660ba85da1e1efd5aec61755/tumblr_mwnfljXRs51r74fx2o4_500.png regrets]] Bubblegum being a "kissy prize" in Wizard Battle.
* CreatorCameo: In "The Hard Easy", Woobeewoo is voiced by Kent Osborne, one of the show's writers and storyboard artists. He also plays Joshua, Jake's and Finn's dad.
** In "Storytelling" and "Jake the Dad" the fox is played by Tom Herpich, another of the show writers and storyboard artists. He also co-wrote those episodes.
** Cole Sanchez voices the Party God.
** Root Beer Guy is voiced by Jack Pendarvis, one of the writers.
** In "Billy's Bucket List," Canyon is voiced by Ako Castuera who co-wrote the episode.
* CrossDressingVoices: Played straight with Creator/PendletonWard as Lumpy Space Princess and Ghost Princess.
** And Steve Little as Turtle Princess.
** Finn is voiced by women in Spain, France, and Japan. In America, he's voiced by boys (both of them brothers).
* TheDanza: James Baxter is named after his animator/voice actor.
* {{Defictionalization}}: Anyone want a [[http://www.thinkgeek.com/product/ef13/ Finn hat?]]
** The card game from "Card Wars" [[http://www.gamenguide.com/articles/9484/20140219/adventure-time-games-card-wars-released-for-tabletop-images.htm is now a real game called "Card Wars".]]
* TheDanza:
** Finn's alter-ego, voiced by Davey Johnson, was named "Davey Johnson" in the episode "Davey".
** The horse that makes people happy, voiced by James Baxter, was named "James Baxter" in the episode "James Baxter the Horse".
* DeletedScene: A lot. For example, in "The Enchiridion", there was a scene that included Choose Goose. [[WhatCouldHaveBeen It would have been his first appearance ever, but they saved him for season 2.]]
* EasterEgg: The ghosts' chanting in "Heat Signature" is a backmasked message to [[http://archives.frederatorblogs.com/adventure_time/2010/09/24/best-of-luck-pat/ Pat McHale.]]
-->'''Ghosts:''' Farewell, Pat. Good luck in New York. Come back soon.
* ExecutiveMeddling: According to Word of God, originally the ending of "Tree Trunks" had Tree Trunks [[spoiler:just explode after eating the crystal apple.]] Cartoon Network made them [[spoiler:add the scene where she is inside the crystal. It's hard to say if said meddling affected "Crystals Have Power", in which she is shown to be completely alive and healthy, and Finn and Jake manage to snap her out of being villainous]].
** Also completely altered the ending of "His Hero", which originally would have ended with Billy's throne being revealed as a SealedEvilInACan once Billy gets up, leading to a YouShallNotPass moment. The new ending does get some crap past the radar though.
** [[http://99u.com/articles/30561/fred-seibert-never-compete-in-the-scrum Fred Siebert]] mentioned that CN tried to get rid of Princess Bubblegum and Marceline.
* FanNickname: The muscular robot-armed Finn from "Mortal Folly" has been named [[Manga/{{Berserk}} Guts]] Finn by users on [[Website/FourChan /co/]].
** Fans often call [[spoiler:Alternate Universe]] Finn "Huckleberry Finn."
** Lady Rainicorn and Jake's [[spoiler:offspring]] are often called [[spoiler:"corndogs"]].
** [[GenderFlip The Ice Queen]] is often named [[spoiler:Simone Petrikov]] by fans.
** Prismo is sometimes referred to as "Gay Origami Jesus" by Website/{{Tumblr}} users.
* FlipFlopOfGod: At one point, the creator (Pen Ward) said that [[spoiler:Tree Trunks was definitely dead]]. But then [[spoiler:"Crystals Have Power"]] came along....
** A while ago, Pen said that the Ice King was [[http://www.formspring.me/buenothebear/q/847624209 six hundred years old]]. Now he says that he's [[http://www.newsarama.com/tv/adventure-time-pendleton-ward-2-120214.html 1000 years old, older than Marceline]], in order to fit it in with the new developments of the show.
* GodNeverSaidThat: Andy Ristaino (character designer) never said that "What Was Missing" was a [[MusicalEpisode musical]]. He said that the episode would kind of resemble one because it has a couple of songs in it.
** This was the reason for the whole "[=BubblegumXMarceline=] Mathematical" fiasco. Frederator took down the video because it made it seem like the show was openly asking for plot input for further [=PBxMarcy=] development and Adam Muto, the storyboard artist and writer of the episode, didn't like [[PanderingToTheBase the video framing that interpretation as only being romantic.]]
* GodDoesNotOwnThisWorld: Pen Ward may be the main creative force behind ''Adventure Time'', but if we wanna get ''really'' technical, Cartoon Network owns the show, not him ([[CaptainObvious though that should be kind of obvious]]). From an interview:
-->'''Pen:''' I get a lot of emails from pople asking, "Can you give me permission to make this?" Well, first of all, I don't own Adventure Time, so I couldn't give permission if I wanted to.
* HeAlsoDid: The pilot ''WebAnimation/BravestWarriors'' (he's much more hands off with the series than he is with ''Adventure Time'').
* HeyItsThatVoice: [[HeyItsThatVoice/AdventureTime Has its own page.]]
* IKnewIt: Quite a few fans correctly guessed [[spoiler:the reason Marceline was after Maja in "Sky Witch" to get Hambo back from her after Ash sold Hambo to her.]]
** And also that [[spoiler:the Grass Blade would result in Finn losing his arm. The only shocker is how quickly it all transpired.]]
* LifeImitatesArt: There is now [[http://www.nasa.gov/mission_pages/msl/multimedia/pia16131.html a Lincoln penny on Mars.]] Either the writers knew it was going there beforehand, or someone that designed/built the Mars Science Laboratory was a fan of the show.
** If neither of those possibilities are correct, it qualifies as one of ''the'' most amazing coincidences '''ever'''.
** According to the [=NASA=] article, it's an old photographer's trick. They put an item they know the size of in the photographs for scale.
* KeepCirculatingTheTapes: The pilot, which Creator/{{Nickelodeon}} owns and has refused to do anything with, presumably to not help the competition.
* LineToGod: Pen has a [[http://www.formspring.me/buenothebear formspring page]] where he answers various questions about the show.
** While Pen's formspring appears dormant, many other staff members also have formspring pages, such as [[http://www.formspring.me/MrMuto Adam Muto- storyboarder]], [[http://www.formspring.me/skronked Andy Ristaino- character designer]], and [[http://www.formspring.me/natazilla Natasha Allegri- character designer and close friend of Pen's]]. Natasha also has her own [[http://natazilla.tumblr.com/ tumblr]] which has some of her artwork (both AT-related and not).
* LyingCreator: Oh, Natasha Allegri, you rascal!
-->'''Asker:''' [[http://www.formspring.me/natazilla/q/221031063827289636 Do you know who will be voicing Marshal Lee?]]\\
'''Natasha:''' arthur kade\\
''(four weeks later)''\\
'''Another Asker:''' [[http://www.formspring.me/natazilla/q/229431674075616660 why did you lie about Marshall Lee's voice?]]\\
'''Natasha:''' because I wanted to see an Arthur kade article on the wiki
* MarthDebutedInSmashBros: Lady Lemongrab made her first official appearance in the comic book.
* MeaningfulReleaseDate: "Mystery Train" (the episode featuring Finn's 13th birthday) aired on March 14th (3/14 or "Pi Day"), which sorta means that Finn's ''birthday'' is on Pi Day. [[FridgeBrilliance Mathematical!]]
* NamesTheSame: BMO shares his/her abbreviation (and colloquial pronunciation) with the Bank of Montreal, which makes the show kind of amusing for Canadian viewers.
* NetworkToTheRescue: Creator/{{Nickelodeon}} planned to develop the short into a series, but pretty much ignored it. When the rights of the short returned to Creator/PendletonWard in 2007, the idea was pitched to Creator/CartoonNetwork and greenlit a year later.
* NoExportForYou: "Fionna and Cake" was never aired in France and Belgium.
** ''Adventure Time: Hey Ice King! Why'd You Steal Our Garbage?!'' was never released outside US.
*** As VideoGamesAwesome pointed out, Canada had only just started airing the first season, so there was no reason to release the game. The crew recieved episodes and the game through outside means.
* TheNthDoctor: After Princess Bubblegum reverts to a 13-year-old, voice actress Creator/HyndenWalch is replaced by Isabella Acres.
* OfficialFanSubmittedContent: Me-Mow.
* OfficiallyShortenedTitle: The "...with Finn and Jake" part was dropped after the first season.
* OldShame: Adam Muto is so ashamed of his performance of Billy's song in "His Hero" that ''[[http://www.formspring.me/MrMuto/q/310851784576874740 he can never watch that part of the episode again.]]''
* OneOfUs: Pen likes ''TabletopGame/DungeonsAndDragons'' and ''VideoGame/{{Halo}}'' (though looking at him, it's probably not that big of a surprise).
** Jesse Moynihan, like many fans of the show, is a [[Website/FourChan /co/mrade]].
* TheOtherDarrin:
** Played straight with Zack Shada. Zack hit puberty and he couldn't get his voice to sound like Finn's anymore, so when the show went from being a Nickelodeon pilot to a Cartoon Network series, the voice director got Jeremy Shada (Zack's younger brother). Now averted with Jeremy, as rather than get rid of him because of his voice changing, the writers incorporated Jeremy's vocal change to Finn's.
** Princess Bubblegum is played by Paige Moss in the pilot and Creator/HyndenWalch in the series.
** Ice King was played by John Kassir ([[Series/TalesFromTheCrypt The Cryptkeeper]], [[VideoGame/MarvelUltimateAlliance Deadpool]], the replacement voice for [[WesternAnimation/TinyToonAdventures Buster Bunny]] when Creator/CharlieAdler left) in the pilot. In the series, TomKenny plays the Ice King.
** In the pilot, Lady Rainicorn was voiced by Creator/DeeBradleyBaker and spoke nonsense. In the show, her voice actress is Niki Yang (the same Niki Yang who plays BMO) and the nonsense was replaced with fluent Korean.
** Ghost Princess is played by Pen in "Loyalty to the King" and Maria Bamford in "Ghost Princess".
** In the video game, Marceline is played by Jessie Seely instead of Olivia Olson. Granted, the difference is barely noticeable.
** In "Davey", to make his disguise more authentic, Finn changes his vocal chords to a more adult tone of DaveyJohnson.
** Cosmic Owl has a more masculine voice than his original voice.
* PlayingAgainstType: HenryRollins as Lady Rainicorn's father.
** PlayingWithCharacterType: At first, the Ice King seems no different than TomKenny's usual characters, until the ChristmasEpisode "Holly Jolly Secrets" [[spoiler:where it's revealed that The Ice King was once a man named Simon Petrikov and that he became the Ice King after wearing a crown that drove him to insanity and may have had something to do with the disappearance of the woman he loved]].
* RealLifeRelative: Olivia Olson is the daughter of Martin Olson, and they voice Marceline and her dad, Hudson Abadeer (respectively).
** Tom Kenny's wife, [[Series/MrShow Jill Talley]] ([[WesternAnimation/SpongeBobSquarePants Karen]]), voices Maja the Sky Witch.
* RomanceOnTheSet: There are rumors that Jessica [=DiCicco=] (the voice of Finn's new girlfriend) is... Pen's new girlfriend.
* ShrugOfGod: Whenever someone is asked [[TheUnreveal whether Susan is human or not]]. The answer is usually "Come up with your own conclusion."
** The same answer is usually given regarding the the relationship between Lemongrab and his clone. Princess Bubblegum and Marceline used to get a lot of this to until Olivia Olson finally just flat out confirmed that they're ex-girlfriends.
* {{Spoiler}}: Though the spoilers don't actually happen "in-show". A lot of the season one storyboards could be viewed online ''before their episodes even aired''. But hey, it would be fun to watch the episodes to see if anything got changed.
** Pen Ward blatantly mentioned at Comic-con that Flame Princess would be Finn's new love interest before "Incendium" aired. However, he didn't spoil her destructive personality and only called her "intense" ([[HarsherInHindsight a word that a member of the audience laughed at]]).
** TV Guide spoiled the fact that the short stories in "Five Short Graybles" are centered around the five senses (sight, touch, taste, smell, and hearing). It wasn't supposed to be revealed until the end of the episode. It really makes "Huh? You still haven't figured it out?" less funny.
* TalkingToHimself: TomKenny voices both the Ice King and his penguins.
** While it's not clear if any of her characters talked to each other, stand-up comedian Maria Bamford has voiced ''twenty-six'' voices for the show, even doing male voices such as Manfried in "Slumber Party Panic" and the Butterfly Bandit in "The Other Tarts".
** Justin Roiland voices Lemongrab, Lemongrab's clone, and all of their children.
* TeasingCreator: A ''lot'', if not most, of the staff count. Exhibit A, Adam Muto:
-->'''Asker:''' [[http://www.formspring.me/MrMuto/q/310851784576874740 What was the deal with the worm king at the end of evicted? Who is that guy and what are his motives?]]\\
'''Adam Muto:''' There's a very interesting story there. He was there to en–[[{{Brainwashed}} wowowowowowowowowowo]]!!![[note]]Hilariously, they actually explained it in a future episode.[[/note]]
** The staff loves to remind the fans that Fionna and Cake and related characters will never be part of the main AT universe.
* ThrowItIn: An unusual example. When Adam Muto originally pitched "What Was Missing", he flubbed the original line that read "I'll get your toy back, kid!", and he said "I'll get your kid back, toy!". They thought it was funny that way, so they kept the line flubbed.
** In "Goliad", the titular character (voiced by writer Graham Linehan’s daughter) badly flubs the line "[[NonSequitur I'm Don Juan Cherry Tempo!]]" but the producers clearly thought it was so adorable and funny that they left it in.
* TributeToFido: Marceline's poodle, [[http://adventuretime.wikia.com/wiki/Schwabl Schwabl]], is based off of Pen's friend Marie's dog, Schwabble.
** Natasha's cat Pancake has been inserted into the show on many occasions.
* TrollingCreator: Natasha Allegri, on an ambiguous level. For example, there's all her Bubblegum/Marceline fan art before and after "What Was Missing" when she claimed that she didn't even understand what shipping ''was''. Hell, someone even [[LampshadeHanging called her out on it]], and she responded, "[[ITakeOffenseToThatLastOne I've never drawn]] [[ComicallyMissingThePoint them kissing.]]" And later, when someone showed her a picture she drew of PB kissing Marceline, she said, "[[LoopholeAbuse It doesn't have my signature on it.]]" (That's only because she drew it for 4chan, and she doesn't sign those pictures.) And there's ''also'' when [[http://natazilla.tumblr.com/post/16013384285#notes she drew this Fubblegum picture]] ''right'' before [[ShipSinking "Incendium"]] aired. And ALSO when she drew Flame Prince just to cause war-shipping in the gender-bent lovers of the fandom.
** A lot of the fandom sees the show's writers as this. For example "Fionna and Cake" [[spoiler:basically compares the Ice King to fanfic writers.]] Many fans see "All the Little People" as [[spoiler:a TakeThat and parody of [[{{Shipping}} shippers]] in general]]. And then there's the end of "Mystery Dungeon" where [[spoiler:Ice King didn't get to make the Fionna and Cake world real, which is what many fans wanted.]]
** Seeing as some fans ship [[HoYay the two Lemongrabs together]], "Another Five Short Graybles" has the original Lemongrab eat the other, as well as revealing that they view each other as brothers rather than lovers.
* VoicesInOneRoom: The cast records their dialogue together in one room, which is rare for an animated show.
* WesternZodiac: Fitting enough that Finn's element is water. His birthday, March 14th, exists in the Pisces period during the year, and Pisces' Zodiac element is water.
* WhatCouldHaveBeen:
** In early storyboards of "His Hero", Billy was named "Hogarth", his throne was actually a shapeshifter [[SealedEvilInACan that he was keeping in check by sitting on it]], and [[DyingMomentOfAwesome Hogarth was originally going to fight the shapeshifter with his survival being ambiguous.]]
** The original storyboard for "The Duke" has Jake imagining how evil the Duke can be. The {{Dramatization}} includes a particularly impressive [[HurricaneOfPuns Hurricane of Nut-Puns]] by the Duke, which includes "CASHEW LATER, COPPERS!" and "CHESTNUT YOUR DAY, JAKE!". However, this was scrapped for time.
** The Princess Plant was originally supposed to be called the Halo Lily.
** [[http://www.scribd.com/doc/12614384/Brothers-in-Insomnia-Storyboard "Brothers in Insomnia".]] Sadly, this was never made into a full episode. And, just to put salt in the wounds, they made an awesome background for it. Also, [[http://www.scribd.com/doc/37568763/The-Glorriors-Storyboard "The Glorriors".]]
** [[http://rebeccasugar.tumblr.com/post/9693381246/fionna-and-cake-monday-at-8-adam-and-i-really Apparently,]] [[GenderFlip Marshall Lee]] ''had'' lines, but they were cut for time. Rebecca Sugar wanted him to be voiced by Creator/DanteBasco.
** The most unfortunate example yet: Pen had to cut ''A HIGH FIVE from an episode!!'' [[http://twitter.com/#!/buenothebear/status/28267009250689025]]
*** [[HilariousInHindsight You know what makes this even MORE hilarious?]] [[http://www.youtube.com/watch?v=P_GNy2kIa68 This clip]] from season four episode ("Five Short Graybles") has a scene '''entirely dedicated to awesome high-fives.'''
** The Lich was going to be known as the Lich King until Blizzard supposedly forced them to [[WritingAroundTrademarks write around trademarks]], and he went through [[http://images.wikia.com/adventuretimewithfinnandjake/images/6/63/Lich_king.jpg two]] [[http://images3.wikia.nocookie.net/__cb20100916035153/adventuretimewithfinnandjake/images/0/0d/Lich_king_fire.png different]] redesigns before settling on the [[http://images1.wikia.nocookie.net/__cb20100921004925/adventuretimewithfinnandjake/images/f/fd/Lich_king_newdesign.png final one.]] During his EarlyBirdCameo, he's referred to by his original name.
*** TomWaits was Ward's original choice for the Lich, but instead they got Creator/RonPerlman. Both are known for their signature [[GutturalGrowler gravelly voice.]]
** As mentioned before, the fact the series was originally to be on Nickelodeon.
** The original ending of "[[http://www.scribd.com/doc/101140913/Sons-of-Mars-Storyboard Sons of Mars]]" [[spoiler:would have shown Death transporting Lincoln back to Ford's Theater before fading to black with the sound of the gunshot.]] The final version has a [[spoiler:gunshot]], but no [[spoiler:Ford's Theater]], implying but not making explicit the events shown in the storyboard.
** There were also several changes to "[[http://www.scribd.com/doc/112716702/The-Lich-Storyboard The Lich]]". For one, Prismo is called "The Almighty Grob", but more importantly [[spoiler:the Lich would've been possessing Billy instead of having killed and replaced him, and Booko would have revealed that Finn's human dad was a hero who was wrongfully imprisoned in an impossible-to-escape dimension--with the implication that ''Billy'' put him there--and is still fighting the other inmates]]. This ties into several examples of TheArtifact. In the actual series, "Grob" refers to a powerful (but not ''all''-powerful) magical being from Mars (full name Grob Gob Glob Grod). This storyboard also reveals that Finn never realized that he was adopted (with a LampshadeHanging on the ridiculous levels of IdiotHero that would come along with this notion), which is obviously not the case in the series. Sadly this meant one of the series biggest [[CrowningMomentOfHeartwarming heartwarming moments]] ended up being cut as well.
** According to Jesse Moynihan, Lemongrab was not originally a socially awkward, dysfunctional, brain-damaged, unadjusted JerkassWoobie in the original outline. He was originally conceived by Pen to be a one-shot, one-dimensional {{Jerkass}} "like Xergiok." However, Jesse stepped in, and decided to give Lemongrab the puzzling amount of depth he has, by making him "weird, isolated, angry, off-putting, with an inability to read social cues." Part of Lemongrab's appeal appears to be his many [[TheWoobie woobie-ish and sympathetic]] traits. If Jesse hadn't fleshed out Lemongrab's character, LG wouldn't have the zealous fanbase he has, and he probably wouldn't have been considered to make a return in the series after his exit from "Too Young".
** The episode "Betty" was supposed to be a double episode, but there was already a double episode in production and Huntress Wizard appeared in a 30 second scene but it was cut for unknown reasons, possibly time reasons.
** [[Main/WordOfGod According to Jack Pendarvis]], Creator/StephenKing was [[http://jackpendarvis.blogspot.com/2013/12/rbg.html briefly considered]] as a voice of Root Beer Guy.
* WhyFandomCantHaveNiceThings: Allegedly, Pen stopped answering Formspring questions because he got tired answering the same ones over and over again.
** The uproar that happened over the [[ShipTease Ship Teasing]] in "What Was Missing" caused "Mathematical!" to stop producing recaps.
** Nat and Pen used to make themselves known on /co/, but they stopped due to... obvious reasons. Nat later came back for the show's second anniversary. She also came back the Sunday night before the season 4 finale.
* TheWikiRule: The fan-made wiki can be viewed [[http://adventuretimewithfinnandjake.wikia.com/wiki/Adventure_Time_with_Finn_and_Jake_Wiki here.]]
* WordOfGay:
** Lead character designer Andy Ristaino [[http://www.formspring.me/skronked/q/264404318386390346 revealed]] that the Gladiator Ghosts are indeed homosexual and in love with each other after "Morituri Te Salutamus" aired.
** Kate Leth draws the Lady Lemongrabs as a couple. In the Fionna and Cake comic book, their relationship is only suggested through (admittedly obvious) [[HoYay subtext]]. Outside of the issue, though, Leth repeatedly draws the Lady Lemongrabs in obvious romantic scenarios.
** Olivia Olson, the voice of Marceline, revealed that someone on the show's crew told her that PB and Marcy used to date, but that they can't outright say it on the show because of MoralGuardians.
* WordOfGod: Princess Bubblegum is actually made of bubblegum.
** Princess Bubblegum's composition is actually a plot point in "Mortal Recoil".
** BMO is "sexless", being a robot, and also genderless. S/He has been called masculine or feminine pronouns by different characters. For what it's worth, BMO is voiced by a woman, and the episode "BMO Noire" uses a feminine spelling; however, that same episode has BMO imagine having a relationship with a female (chicken), while in another s/he pretends to be a "real boy."
** After years of hints in-show Olivia Olson finally confirmed that PB and Marceline are ex-girlfriends (as if it wasn't [[HoYay/AdventureTime blatant enough already]]).
* WorkingTitle: Many of the episodes have had original titles that were changed. Some examples:
** "The Royal Promise" → "Slumber Party Slaughter" → "Slumber Party Panic"
** "Meet the Ice King" → "Prisoners of Love"
** "Ice King and Son" → "What Is Life?"
** "Return to Nightosphere" → "Marceline's Dad" → "Nightosphere" → "It Came from the Nightosphere"
** [[RunningGag "Click-click!"]] → "Blood under the Skin"
** "Born to Die" → "The Real You"
** "Finn the Wizard" → "Wizard"
** "Door Jam" → "What Was Missing"
** "The Croak List" → "The New Frontier"
** "Worm King" → "King Worm"
** "Card Quest" → "Card Wars"
** "An Assassin In Jake's Nose" → "Jake vs. Me-Mow"
** "Word War II" → "Paper Wars" → "Paper Pete"
** "Heart of the Fire Kingdom" → "Incendium"
** "They Went To The Nightosphere" → "Return to the Nightosphere"
** "Prince Huge" → "The Hard Easy"
** "Help" → "I Remember You"
** "LSP Gets Robbed" → "Candy Streets"
** "Only Wizards Allowed" → "Wizards Only, Fools"
* WriteWhoYouKnow: In "Return to the Nightosphere", Marceline's dad is officially given the name Hunson Abadeer. While it seems like a [[MeaningfulName fancy name that means something]], it's actually [[http://www.formspring.me/jessemoynihan/q/321520114778259346 the name of the family Nissan of storyboard artist Jesse Moynihan when he was a child.]]. Also the name of his first band; they wrote one song titled "Girls Girls Girls".
** Tree Trunks was based on as well as written expressly for Livingston, who is an old friend of Creator/PendletonWard's family.
** Not so much a person, but a ''urinal'' where Penn works was the inspiration for the Cosmic Owl. The light reflects off the very shiny metal urinal and resembles the Cosmic Owl. This strange little tidbit of triva came from a interview with ''Magazine/NintendoPower''.
* WritingByTheSeatOfYourPants: [[http://www.formspring.me/jessemoynihan/q/353656831651890938 Yeah, pretty much.]]
* YouMightRememberMeFrom: See HeyItsThatVoice, as a lot of the voice actors you might remember from other roles.

!!General Trivia:
* It has become so successful that most of the crew members past and present are now getting work in most of Cartoon Network's and Disney's [[WesternAnimation/RegularShow other]] [[WesternAnimation/StevenUniverse headlining]] [[WesternAnimation/GravityFalls shows]]. The show has pushed several of the cast and production members into the spotlight for animation fans and executives, who suddenly saw them appear in later shows thanks to ''Adventure Time''.
* Did we mention the creator also storyboarded on ''WesternAnimation/TheMarvelousMisadventuresOfFlapjack''? You can actually see his unique "oomph" [[DependingOnTheArtist in the episodes he storyboards]], where there are jointless limbs, cute/scary faces and figures, and a very loose style compared to the other artists. The creator of ''Flapjack'' is in turn a writer and producer on ''Adventure Time'', and even voiced a wood witch and a worm's butt.
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