Other mistake: The Lakota is attacking a small group of white men. One is face down on the ground, and he lifts his head to cut his throat. In the background are two cowboy actors joking and twirling their guns. One drops their gun and picks it back up. (00:20:43)
Other mistake: When Charlotte Hale takes a cigarette from Theresa Cullen, she puts it in her mouth the wrong way around. (00:11:45)
Trace Decay - S1-E8
Factual error: When the armed party comes into town to steal the safe in the bar, the leader points a repeating rifle at a victim on the ground and shoots. When he fires a used cartridge flies from the gun. Repeating rifles do not eject cartridges when they are fired. Automatic weapons eject a spent cartridge when fired. Repeating rifles only eject the cartridge when the lever is wrenched. (00:32:20)
Continuity mistake: When the Man in Black wakes up with a noose around his neck, there are only 4 distinct loops in the hangman's knot. A few seconds later, he cuts the rope and collapses to the ground, and there are now 6 distinct loops in the hangman's knot.