Audio problem: When the ambulance goes to the hospital and the people disappear and he answers, "I'm sorry about that," you can see clearly that his lips don't actually move. (00:40:15)
Audio problem: When Michael Douglas catches up with James Rebhorn at the zoo, just as Douglas grabs Rebhorn he pulls him in close and brandishes his pistol. You hear the sound of the gun being cocked (i.e. the hammer being pulled back), but when the camera actually shows the gun, the hammer is not in the cocked position. (01:43:10)