Other mistake: When Sora and the gang return to confront Cerebus in the Colosseum (when Hercules rescues Cloud), you can see Sora's keyblade pass through Goofy's shield.
Continuity mistake: Before the fight with the pot barrel spider/centipede boss in Agrabah, after Iago steals the lamp from Aladdin he lands on Jafar's left shoulder. After Jafar says, "Attack," there is a cut and Iago is no longer there.
Trivia: After you return to 'Hollow Bastion', after the fight with Riku, you can find Belle in the castle library and she will gladly reunite with the Beast. In the film 'Beauty and the Beast', Belle loved books and to read, making the library an ideal location for her to be found.