During the scene where Bill Capa is getting dressed, he goes from having his shirt totally unbuttoned to completely buttoned in less than three or four seconds.
The wounds on Rose's hands disappear in an improbably short time.
During the first car chase, the passenger's side of the red car slams into a truck while the driver's side is shown unscratched. In the following close-up shot of the car, the driver's side is show severely damaged. But in the next shot the damage is gone.
Shortly after his patient's suicide, we see Bill from behind talking with an another man, and he makes some comment about suicide and motions to his head with his right hand. But when the camera shows him from the front, he is putting his left arm down.
The shoes of Capa and Rose disappear a few seconds after they fall in the pool.
At one point during the first group session, Ritchie notices that Bill is wearing one green sock and one red, because Bill is blind to the color red. To Bill, only the red sock would be gray, and the other would still be green and he'd know they were mismatched.
When Capa talks to Mrs. Niedelmeyer, there's a 3-foot long shadow of the boom mic on the door.