Factual error: In the end scene, a major shoot out occurs. A man is hit, and as he painfully dies (and rather slowly), he fires his revolver a few to several times with just the agonizing twitching of his trigger finger. He never cocks the gun, and in those days, they did not have double action revolvers.
Suggested correction: Yes, they did have double-action revolvers. Those date back to the Civil War.