Revealing mistake: In the scene where Edward Burns, Paul Giamatti and Brian Van Holt are at Big Al's house, Big Al is dead in his chair with his eyes open. As Edward Burns walks in front of him, Big Al blinks his eyes.
Revealing mistake: In the scene where Travis cocks the gun and jams it in the back of Ed Burns' head, the gun is locked back in the empty position after it is cocked. This shows the gun was in fact, empty the whole time. Not much use threatening someone with an empty gun.
Revealing mistake: In the scene where the fed's cars drive in to arrest the two crooked cops, there are tyre marks on the tarmac, right hand side of the screen, probably left there from a previous take. (01:24:30)