Continuity mistake: In the scene where they ride to the top of a hill on horseback, you can see a white van and power lines in the distance.
Continuity mistake: The book Geronimo steals from the wagon train is red. When he gives it to his wife it is black.
Continuity mistake: Approximately 46 minutes into the film, Robert Preston is testing a new bullwhip. The whip is in his left hand as he brings his arm back and cracks the whip. He brings the left arm back for a second crack, and the shot changes to a closer angle just as he brings the whip down, only now it is suddenly in his right hand and not the left. The editing, the sound effect, the arm swing all seem perfectly coordinated, except that the whip changed hands between camera set-ups.
Continuity mistake: The colour of John Wayne's shirt changes from black to grey after entering the burnt out building. It can not be dust, as the covering is far too even and complete, and a couple of shots later it is black once more.