* ActorAllusion Rikku, voiced by Tara Strong, is a fairy in this continuity. She had previously played a fairy in ''WesternAnimation/TheFairlyOddParents''. Additionally the YRP gain the ability to fly, merging Strong with another of her famous roles; Bubbles of ''WesternAnimation/ThePowerpuffGirls''.
* AuthorAppeal: Sea salt ice cream is an actual product sold at Tokyo Disneysea that Nomura enjoys. He imagined that it would be something the characters would eat over summer vacation, so it was put into the game.
* ColbertBump: Due to Space Paranoids being a playable world, and [[EnsembleDarkhorse beloved]] by many fans ([[GermansLoveDavidHasselhoff especially in Japan]]), the game gave a lot of exposure for ''Film/{{Tron}}''. Some fans credit the game for helping the film with getting [[Film/TronLegacy its long-awaited sequel nearly five years later]].
* CreatorsFavorite: [[http://disneyexaminer.com/2014/12/directing-heart-interview-tetsuya-nomura/ Nomura stated in a 2014 interview]] that the Pride Lands is his favorite world.
* ExecutiveMeddling: According to Creator/TetsuyaNomura, he had originally planned on only including characters from ''Final Fantasy'' titles he personally designed. He eventually caved in to the urging of the staff, which is how [[VideoGame/FinalFantasyVI Setzer]] and [[VideoGame/FinalFantasyIX Vivi]] were added to the game. The gamble perhaps didn't pay off as well as they would've hoped; Setzer, in particular, was criticized for heavily deviating from his original incarnation's personality, moreso than was par for the course in ''KH''.
* FanNickname:
** Before his name was revealed, fans took to calling Roxas the Blond-Haired Kid (BHK).
*** To those trying to guess the plot of the sequel from the trailer, Roxas was often called Dual-Wielding Unknown, while Riku was called Blindfolded Unknown.
*** Oddly enough the trailer isn't even part of the game; it's a flashback that takes place right before it. It is, however, [[spoiler: the final battle in Days.]]
** Don't forget "Orgy XIII".
** Fans also commonly refer to Xemnas as "Mansex" - an anagram of his name. This paved the way for Bigrax for Xigbar, E-Sexual for Lexaeus, and finally Rentx-a-ho (Rents a ho) for Xehanort.
** Pete is given the nickname [[LetsPlay/HellFireCommentaries Captain Ass-Zipper]], due to, well, [[ExactlyWhatItSaysOnTheTin look!]]
** LetsPlay/ChipCheezum and friends popularized "Dogstreet" for Pence, named after the writing on his shirt.
* FandomNod: In addition to all the Disney/Final Fantasy references, there is a literal fandom nod during Cloud and Leon's snark-fest in the sequel. As they do their BackToBackBadasses moment, it echoes the rivalry between fans of their respective games.
* HeyItsThatVoice:
** Once you hear [[Creator/CamClarke Adult Simba]] talk, you're never going to get [[VideoGame/MetalGearSolid Liquid]] [[VideoGame/MetalGearSolid2 out of your mind...]]
** As soon as you hear Pence, [[WesternAnimation/FostersHomeForImaginaryFriends no doubt about it, but you'll start thinking of a sweet little eight-year-old boy with a jerk of an imaginary friend]].
** Creator/CoreyBurton provided [[Film/{{Tron}} Sark's]] voice because Creator/DavidWarner, his original actor, was unavailable at the time. Burton previously voiced Shockwave in ''WesternAnimation/TheTransformers'', whose voice was inspired by Warner's performance as Sark.
** Believe it or not, [[WesternAnimation/{{Recess}} Randall]] appears as Demyx.
** Creator/ToruOkawa, Iago's Japanese voice actor, just happens to be [[Franchise/RatchetAndClank Clank]].
** Xigbar had also appeared on the TV Show ''Series/StillStanding''.
** Play the game in Japanese, and you'll notice that Tron sounds a lot like [[{{Anime/Pokemon}} Professor Sycamore]]. That's because they are both voiced by Creator/HiroshiTsuchida.
** In the French dub, Organization XIII is ruled by [[Franchise/JakAndDaxter Damas]].
** Seifer in the English version is [[Franchise/BoyMeetsWorld Eric Matthews]] and [[Franchise/BatmanBeyond Future Batman]]
** The English version of Vivi sounds rather like [[WesternAnimation/AsToldByGinger Ginger Foutley]].
** In the Spanish dub, Sora shares his voice actor (Adolfo Moreno) with [[Anime/{{Pokemon}} Ash Ketchum]].
* TalkingToHimself: In the Japanese version, Donald Duck, Genie and Stitch are voiced by the same seiyuu, Creator/KoichiYamadera.
* TheOtherDarrin:
** Creator/RichardEpcar replaces [[spoiler:Billy Zane as Ansem, Seeker of Darkness]].
** Mae Whitman replaces Christy Carlson Romano as Yuffie.
** Doug Erholtz replaces David Boreanaz as Leon.
** Mena Suvari replaces Mandy Moore voiced Aerith.
** George Newborn replaces Lance Bass as Sephiroth.
* WhatCouldHaveBeen:
** Axel was originally supposed to die at the end of the prologue. The development staff liked him too much to remove him from the story that early, so his role was expanded.
** Buzz and Woody from ''WesternAnimation/ToyStory'' were going to be a Summon in the ''Final Mix'' version, but were scrapped. Their unfinished models are still in the game files.
** Early trailers suggest that the outside walls of Hollow Bastion's castle from the first game would be playable.
** Variations on the Behemoth and Wyvern Heartless were present in the Battle of 1000 Heartless in older trailers.
** Xemnas was going to have two more forms for the final battle, the [[http://images.wikia.com/kingdomhearts/images/4/49/King.jpg "King" and "Centaur"]]. They would have him apparently breaking up and surrounding himself with chunks of the Dark City to create something akin to the giant dragon that is fought in the final game.
** The game was planned to feature battles against all the Organization members in the Coliseum. This was dropped due to lack of time and eventually implemented as the Data Bosses in ''Final Mix''.
** Some concept art shows that [[http://www.kh2.co.uk/assets/kh2/artwork/kh2uc12.jpg double-bladed Keyblades]] were considered at one point.
** David Warner did not reprise his roles as the MCP and Sark even though he wanted to, as he had already committed to another role.
** There is an unused version of the ''VideoGame/FinalFantasyIX'' world map theme in the game's coding. There are a few theories for it: some think it was going to be used for the fight with Vivi, and others think that Vivi (or even other characters from FFIX) was going to play a larger part in the story.
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