Other mistake: While playing as the Joker, despite his claims that he'll kill all enemies he comes across, if you zoom in on their corpses, you'll notice that they're still breathing, regardless of how you take them out (take-down, shot, or blown up). It's easier to spot this mistake in the invisible predator challenge maps.
More trivia for Batman: Arkham Asylum
Question: In the comic books, animated series, etc, was there a passage connecting the facility to the bat cave like there was in the game? I thought that the bat cave was further away, like under Wayne Manor.
Answer: To add to the answer, Batman tells Oracle that he found the cave after saving an inmate from committing suicide and had secretly been moving supplies to the cave after discovering its location.
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Answer: It's not the actual Batcave, it's a secondary location Batman set up in case of emergency. Oracle actually makes a comment along those lines the first time you access it.