- Actor Allusion:
- Vexen. Who would've guessed that Uryuu Ishida, of all people, would become a mad scientist? Captain Kurotsuchi must've rubbed off on him.
- Larxene shares many similarities to Asuka, basically sharing her bad attitude but with fewer redeeming qualities and an even more damaged psychosis. Tellingly, Nomura said that Larxene's voice was the first one cast for RE:Chain of Memories and that Yuko Miyamura was always his personal choice.
- Dawson Casting: In the remake, Sora is supposed to be fourteen since the game takes place immediately after Kingdom Hearts I, yet the voice of Haley Joel Osment sounds nothing like a kid anymore. This is because the remake was created and dubbed a couple years after Kingdom Hearts II (when Osment had aged to be point where he couldn't pull off the voice he used in I anymore) and the dubbing team didn't decide to cast a voice double for Sora, leading to some serious Vocal Dissonance if you play the games in chronological order.
- Fan Nickname: The Riku Replica is occasionally referred to as "Repliku". It's even his official name in the D-Report in the German version.
- Flip-Flop of God: Nomura stated in an interview that Nobodies do not age (with the exceptions of Roxas and Naminé). Kingdom Hearts: Birth by Sleep appears to contradict this with Ienzo, who was in his early teens when he became a Nobody yet appears in his 20s as Zexion.
- Keep Circulating the Tapes: Square-Enix seems to prefer re-releasing the PlayStation 2 remake over the original Game Boy Advance version, pretty much confining the original version to the latter system.
- Marth Debuted in "Smash Bros.":
- The Diamond Dust and One Winged Angel Keyblades are in this game. They actually came from Final Mix, which nobody outside of Japan saw without importing it (at least until 2013 and the HD I.5 ReMIX).
- The Neoshadows, who only showed up in the original game in the secret ending, but were limited to a secret cutscene, and similarly to the above Keyblades were introduced as actual enemies in Final Mix. They return in this game.
- No Export for You: Australia didn't get the PlayStation 2 remake, and had to wait nearly five years until the game was remastered for the PlayStation 3.
- The Other Darrin:
- The GBA version of the game features high-level staff voicing the Organization, except for Axel, who was voiced by professional VO artist Keiji Fujiwara. For the more fully voiced PlayStation 2 remake, Fujiwara was retained for Axel and other professionals were brought in to voice the rest of the Organization.
- In the Re:Chain of Memories version, Alyson Stoner plays Kairi instead of Hayden Panettiere.
- Corey Burton voices DiZ in lieu of Christopher Lee in Re:Chain of Memories.
- Relationship Voice Actor: In Re:Chain of Memories, Kairi and Naminé, who are essentially two halves of the same whole, are voiced by Alyson Stoner and Meaghan Martin respectively. Those two also played archenemies in Camp Rock. Make of that what you will.
- What Could Have Been:
- Deep Jungle was intended to have made a return, but it had to be axed because Disney lost the license to Tarzan. All that's left in the game is a (Dummied Out) King of the Jungle Keyblade card.
- The Dive to the Heart was planned at some point. It presumably would've served as the gameplay tutorial, which is instead a normal conversation and fight in Traverse Town.
- Marluxia was originally planned to be female, hence his pink hair and feminine appearance. It was decided that having the only two female members of the Organization conspire to forcibly overtake it had too many Unfortunate Implications, so the gender was changed.
- Before the release of the game, Derek Stephen Prince stated on his MySpace blog that Christopher Lee had reprised his role as DiZ for Re:Chain of Memories, but this ended up not being the case, as Corey Burton voiced him instead.
Trivia / Kingdom Hearts: Chain of Memories