History CelebrityParadox / FIlm

** Professor X is mentioned in this film. Creator/JamesMarsden (Tom) played the older Cyclops in the Film/XMenFilmSeries.

* ''Film/{{Sonic the Hedgehog|FilmFranchise}}'':
** ''Film/Sonic the Hedgehog|2020}}'':

* ''Film/{{Sonic the Hedgehog 2|2022}}'':
** During the confrontation in Siberia, Sonic refers to Knuckles as [[Creator/MarvelComics the Winter Soldier]]. Sonic therefore appears to be familiar with the Franchise/MarvelCinematicUniverse, which features the character Heimdall. Heimdall is played by Creator/IdrisElba, who, in the Sonic film universe, voices Knuckles.
*** Sonic is also shown to be a fan of ''Franchise/TheFastAndTheFurious''. It's never confirmed if he's seen ''Film/HobbsAndShaw,'' which Knuckles is in.
** Speaking of comic books, Batman and Professor X are mentioned. No one remarks on any resemblance between Eggman and Creator/JimCarrey, who played the Riddler in ''Film/BatmanForever,'' or between Tom and Creator/JamesMarsden, who played the older Cyclops in the Film/XMenFilmSeries.
** During [[Film/SonicTheHedgehog2020 the first film]], Sonic is a big fan of Creator/KeanuReeves, watching his films through other people's windows in secret. Keanu would later be cast as Shadow the Hedgehog for the third.

** Mark gets to "fly around like Franchise/IronMan" in his suit. Creator/MattDamon made a cameo appearance in ''Film/ThorRagnarok''; also appearing with him here are Creator/ChiwetelEjiofor (Karl Mordo), Creator/MichaelPeña (Luis in the first two ''Film/AntMan'' films), Creator/KateMara (a cameo as a U.S. Marshall in ''Film/IronMan2''), Creator/SebastianStan (The Winter Soldier) and Creator/BenedictWong (the sorcerer Wong), the latter two having had screen time with Creator/RobertDowneyJr as Iron Man himself.

** Mark gets to "fly around like Franchise/IronMan" in his suit. Creator/MattDamon made a cameo appearance in ''Film/ThorRagnarok''; also appearing with him here are Creator/ChiwetelEjiofor (Karl Mordo), Creator/MichaelPeñaCreator (Luis in the first two ''Film/AntMan'' films), Creator/KateMara (a cameo as a U.S. Marshall in ''Film/IronMan2''), Creator/SebastianStan (The Winter Soldier) and Creator/BenedictWong (the sorcerer Wong), the latter two having had screen time with Creator/RobertDowneyJr as Iron Man himself.

** Mark gets to "fly around like Franchise/IronMan" in his suit. Creator/MattDamon made a cameo appearance in ''Film/ThorRagnarok''; also appearing with him here are Creator/ChiwetelEjiofor (Karl Mordo), Creator/SebastianStan (The Winter Soldier) and Creator/BenedictWong (the sorcerer Wong), the latter two having had screen time with Creator/RobertDowneyJr as Iron Man himself.

** Mark gets to "fly around like Franchise/IronMan" in his suit. Creator/MattDamon made a cameo appearance in ''Film/ThorRagnarok; also appearing with him here are Creator/ChiwetelEjiofor (Karl Mordo), Creator/SebastianStan (The Winter Soldier) and Creator/BenedictWong (the sorcerer Wong), the latter two having had screen time with Creator/RobertDowneyJr as Iron Man himself.

* Presumably invoked intentionally in ''Film/TheMartian'' with the secret meeting known as Project Elrond, named after the meeting in ''Franchise/TheLordOfTheRings'' in which Elrond discusses destroying the One Ring. As Boromir, Creator/SeanBean was at this meeting.
** Mark gets to "fly around like Iron Man" in his suit. Fellow astronaut Chris Beck is played by Creator/SebastianStan (The Winter Soldier), Mission Director Vincent Kapoor is played by Creator/ChiwetelEjiofor (Karl Mordo) and JPL Director Bruce Ng is played by Creator/BenedictWong (the sorcerer Wong).

* ''Film/Ghostbusters1984'': During the montage of released ghosts terrifying NYC, Louis/Vinz walks past a movie theater in Times Square showing ''Film/TradingPlaces'', which starred Creator/DanAykroyd (Ray Stantz).

* ''Film/Ghostbusters1984'': During the montage of released ghosts terrifying NYC, Louis/Vinz walks past a movie theater in Times Square showing ''Film/TradingPlaces'', which starred Dan Aykroyd (Ray Stantz).

** Also in ''Part II'' is the Jaws 19 advertisement. His mother is played by Creator/LeaThompson who had a part in ''Film/Jaws3D'' as Kelly who was attacked but survived. Marty doesn't like the shark which might be a reference to the part. Additionally, the original ''Jaws'' was directed by ''Back to the Future'' executive producer Creator/StevenSpielberg, who has a cameo in the first film as a driver whose car Marty latches onto.

** ''Film/StarTrekIVTheVoyageHome'' was largely a FishOutOfTemporalWater comedy in which the ''Enterprise'' crew goes back to 1986, an era by which ''Star Trek'' was so influential it seems like it would be hard to encounter anyone who wouldn't recognize them. However, prior to filming in San Francisco, the film crew sent out people dressed up in Star Trek uniforms to see if anyone would notice them, to see whether or not people would crowd them whenever they went out in public to do the filming. [[UnusuallyUninterestingSight No one gave them a second glance.]]
*** The novelization has Kirk introduce himself and Spock to Gillian by saying, "I'm Kirk, and this is Spock"--names that even a non-Trekkie in the 1980s would probably recognize, and she doesn't respond, shall we say, as if they just identified themselves as characters from a popular TV series. The movie never deals with what names any of the crew go by when interacting with people from this time.

** The fact that Bruce Wayne is a public figure with an InUniverse profile on par with the likes of Creator/HowardHughes, Bill Gates, or Elon Musk can lead to this. One wonders how often he gets mistaken for [[ Series/Batman1966 Adam West]], [[Film/Batman1989 Michael]] [[Film/BatmanReturns Keaton]], [[Film/BatmanForever Val Kilmer]], [[Film/BatmanAndRobin George Clooney]], [[Film/TheDarkKnightTrilogy Christian Bale]], [[Franchise/DCExtendedUniverse Ben Affleck]], or [[Film/TheBatman2022 Robert Pattinson]] and vice / versa with the actor.

** The fact that Bruce Wayne is a public figure with an InUniverse profile on par with the likes of Creator/HowardHughes, Bill Gates, or Elon Musk can lead to this. One wonders how often he gets mistaken for Creator/AdamWest, Creator/MichaelKeaton, Creator/ValKilmer, Creator/GeorgeClooney, Creator/ChristianBale, Creator/BenAffleck, or Creator/RobertPattinson and vice / versa with the actor.

* In ''Film/BladeTrinity'', the Nightstalkers use ''ComicBook/TheTombOfDracula'' to show the Daywalker who the BigBad is. The character Blade first appeared in ''The Tomb of Dracula'' #10.