Continuity mistake: After Stark is paralysed and slightly recovers, he goes to get his energy. Right then the blood around his left ear has vanished. Being seconds away from dying, the last thing he would think of is taking a shower.
Continuity mistake: In the motel room, Betty gives Bruce a new heart monitor watch, still in its box. In a subsequent shot, the box has disappeared and Bruce is putting the watch on. The cut to Betty and back is too fast for him to have taken the watch out and junked the box. (01:04:10)