Mr. Freeze: You will bring me Nora or you will die.
Professor Hugo Strange: I feel I should thank you, capturing Bruce Wayne is so much easier than Batman.
Batman: It was all a lie. There's nothing wrong with you.
Joker: Nice of you to say. But you of all people should know there's plenty wrong with me.
Revealing mistake: When Clayface disguised as Joker is holding Talia hostage in the movie theater, they are both standing on stage in front of the screen with a movie playing. However, they are not casting shadows on the screen. Also, no shadow appears on the screen when Clayface takes on his true form.
Trivia: When doing the side-mission "Enigma Conundrum", after going to where the first Riddler room is located, look up and you will see a sign for a place called "The Black Canary." The Black Canary is another DC Superhero and member of The Justice League.
Question: Why didn't Batman just contact Gordon and tell him what was really going on in Arkham City? They could use that against Professor Strange and stop Protocol 10 before it even began.
Answer: Because Batman didn't know until it was too late, and there was interference as he spoke to Alfred, if you remember hearing that. So contacting Gordon would've been even harder.
Rob245