The Joker: This city deserves a better class of criminal and I'm gonna give it to them. You'll see. I'll show you.
To prepare for his role as the Joker, Heath Ledger lived alone in a hotel room for a month, formulating the character's psychology, posture and voice (the last one he found most difficult to do). He started a diary, in which he wrote the Joker's thoughts and feelings to guide himself during his performance. He was also given Alan Moore's comic "Batman: The Killing Joke" and "Arkham Asylum: A Serious House on Serious Earth" to read. Ledger also took inspiration from Alex in A Clockwork Orange(1971) and Sid Vicious. See more...
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The Dark Knight (2008) - 6 visible crew/equipment errors
When The Joker gets on the bus, after blowing up the hospital, about halfway along inside the bus is a large camera set-up. This has been submitted a few times now but keeps being corrected by people claiming the camera is supposed to belong to Mike Engel's news crew. This is not the case as the camera in question is not only too large to be hand held or shoulder mounted (it is one of the IMAX cameras used to film the scene) but also has a thick black cloth draped over it for the cameraman to work beneath. Obviously not a camera used by any news crew. This is a visible piece of equipment used to film the scene and is a valid mistake.