Continuity mistake: Upon seeing Donald Duck's footprints in the sand, Chip walks the length of one footprint, leaving eight of his own footprints as he goes. He fetches Dale to show him Donald's footprints but when Chip reaches the footprint he walked across, his own footprints have vanished.
Plot hole: When major Singleton challenges Brant Royle to a duel with single shot pitons, he fires one pistol, and leaves the other pistol on the bar. He then goes into his carriage and shoots himself. He only has the pistol that has already been fired.
Factual error: Waco Johnny Dean played by Dan Duryea grabs a pistol from a bystander and then gets shot multiple times by Jimmy Stewart. As Waco goes down he fires several rapid fire shots from a double action revolver. Not likely given the time period some time after the civil war.