Deliberate mistake: When Lex busts Joker out of Arkham Asylum, he uses his Deconstructor gun on the LEGO wall. It takes it about 8 seconds to pull the LEGO apart for Joker to get out. The same amount of time is taken when he demonstrates it to Joker and frees Penguin. Yet when Joker grabs it and uses it to free Catwoman and Two-Face, that time is cut in half. And then yet again when they are leaving on the chopper, Joker fires it 3 more times, freeing Poison Ivy, Harley Quin, and The Riddler. It barely takes a single second on each of those. (00:17:40 - 00:19:35)
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Trivia: The opening theme to this movie is the same theme used in the 1989 Batman film, directed by Tim Burton. The opening sequence even plays homage to that film by having camera movements close up around the Batman emblem in the same fashion, and the names of the people and production team appear in the same order at the same time in the same position of the Bat symbol in both movies, most notably when the director's name appears. Funnily enough the director of this movie is named Jon Burton, no relation to Tim. (00:00:10)