Continuity mistake: Near the end of the movie, when Ed Leland is about to enter the Customs Office, the insignia on his hat is intact, but when he enters it has disappeared.
Continuity mistake: When Duncan tries to explain his version of the raid of the Camerons' lodge to Cora part of his uniform is a read seat-belt-like piece of cloth. This wasn't there in the scene preceding imediately. (00:47:30)