Revealing mistake: When Tony Stark is approaching his father Walter in the hospital bed, what looks to be a hair on the animation cel appears to the left (viewer's right) of Walter's head, beginning on the pillow and extending off the bed, and then disappears after a few frames, just before Tony steps into the shot. (00:07:32)
Revealing mistake: When Danziger is rolling down the cliff it's obviously a stuntman in a really bad wig. (00:27:50)