Factual error: Joker, Penguin and no less than four henchmen all manage to hide in the Batmobile's trunk and leap out when it enters the Batcave. Even for Batman, this is stretching credibility more than a bit. There's no way the Batmobile's trunk could hold six adults and still close (and it was closed). Two might fit, even three in a pinch - but not six.
Continuity mistake: The Batmobile pulls up in front of the Platter-Porium, and you can see that only Batman and Robin are inside the car. When the shot cuts to close-up, though, Venus is sitting in between them. (Tight squeeze: it's a 2-seater and she must be straddling the transmission hump and hand brake - ouch.) The shot cuts back to full for them to jump from the car, and Venus has disappeared again.
Continuity mistake: When the Joker directs Gordon and O'Hara to look at the statue of Justice, they look at it from a front view. But when Joker comes out of the Police building where he left them frozen, it's from behind the statue, rather than in front.
Add timeMovie Nut