Other mistake: When you enter the caves just after Killer Croc tells you he's going rip you apart, if you try to use the grapple, the grapple will not stick - Batman will say that the place is falling apart, and you need to climb manually. You can't grapple any of the edges, yet, if you fall into a pit and press RB to "Escape" like most other parts of the game, he'll grapple up to the most recent edge, despite his previous claim.
Audio problem: When Batman types on the computer in Dr. Young's office, the clacking sounds are woefully out of synch with his hand movements, not to mention his fingers never actually touch the keyboard.
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.
Trivia: After Dr. Young is killed in the warden's office, go back down the stairs but do not go through the archway. Instead, after going down the steps, turn right and you will come to a blank wall. Spray the explosive gel on the wall three times and then detonate it. The wall will break apart and you will find a secret room. Go inside and you will find blueprints for the Arkham City Prison Complex.
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.
Question: Why didn't Arleen Sorkin reprise her role of Harley for Arkham City and Arkham Knight?
Answer: Arleen Sorkin had retired from voicing the character around the time this game was being made. Her last voice role as Harley Quinn was in DC Universe Online, which was released the same year as Arkham City (2011).
Question: Why would Poison Ivy accept several Titan shots from The Joker? She hates him.
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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.