Revealing mistake: A scene in which a group of soldiers appears to be running uphill was obviously filmed with a tilted camera because all the trees in the background are leaning at a 65-degree angle.
Factual error: General Custer and the cavalry are shown in the final scene, after Jack McCall killed Wild Bill Hickok. In real life, General Custer was killed in June 1876, and Hickok was killed in August 1876.