Continuity mistake: When Kevin Costner gets hit on the head by the top frame of the door, he is knocked out unconscious. Yet, when he gets back up after regaining consciousness, the blood from is head had been running down his nose. Don't you think that as he was lying down in a horizontal position, the blood would run down over the eyes towards the ears?
Continuity mistake: At the close of the buffalo hunt, Wind in his Hair cuts out the liver of the buffalo, holding it in two hands. He stands to take a bite out of it and it's already about half its previous size. When he hands it to John Dunbar, it shrinks dramatically in size again, and is a different colour and shape.
Continuity mistake: When Kicking Bird is trying to steal Cisco and Dunbar frightens him away, he falls over the fence. He scares his horse, who runs off to his right. But then Kicking Bird jumps up and runs to his left, and suddenly his horse is waiting for him there, standing still.
Continuity mistake: After Dunbar and Timmons have arrived at Fort Sedgewick and they realize everyone is gone, after Dunbar says "Not at the moment, we don't know what happened," the shots of Timmons alternate from having no egg on his face to having a lot egg on his face, especially on the tip of his nose.