Factual error: Near the end, when Cooper and Rachel are talking in the street, you can see in the background a multi-story brick and glass office building. It appears again a few shots later.
Factual error: It seems unlikely that the bullet hole in Harmonica's jacket should have burned edges - he was shot at a distance of more than ten metres. (00:36:35)
Factual error: When Pauline is burying her husband in the cemetery there is a shot of a mountain with vultures swarming around it and an antenna mast is visible on top of the mountain. (00:24:18)