When Brady gets shot, he is first seen to be shot in the stomach but when he is lying on the ground the wound has moved to his chest area.
When Brady wakes Bill up to show him his new haircut and have him visit his mother, Bill's hair is unkempt. When the shot goes back to Bill his hair is magically brushed.
When Brady goes to sleep in the waterbed with the black light on he is fully dressed. When he wakes up, he's in a t-shirt and boxer shorts.
(at around 1 min) When the twins are talk talking outside, his grip on the beer bottle keeps shifting between scenes, and also the watch he keeps changing its size and position on the hand.