Miscellaneous: In the scene where Andrea is being sucked into the fan at the Gotham worlds fair, Batman rides in on his motorcycle. He turns into the fan to rescue her, but his cape is flapping in the opposite direction to the fans sucking.
Audio/visual unsynchronized: After Batman has left Andrea's apartment she drops a glass. We hear the sound of the glass shattering, but when the camera zooms out we see the glass is still in one piece.
Revealing mistakes: During the opening sequence, the camera pulls back dramatically through the myriad buildings of Gotham City. As this occurs, the camera actually passes through several buildings - a common 3D animation problem when rendering. As a result, a few buildings "pop" into view out of nowhere.
Continuity: During Batman and Joker's fight, Batman kicks out one of Joker's teeth, later on when Joker puts on his jet pack and starts to take off he has all of his teeth, but in the next shot his tooth is missing again.
Continuity: When Andi comes to Bruce's house the first time and Bruce is practicing jujitsu he trips Andi. When she hits the ground she is wearing a sweater but before she was wearing a sleeveless blouse.