Continuity: In the final duel, when Gary Cooper is shot on his left arm, he grabs the spot where he was supposedly wounded with his right hand, then takes off the hand, and we don't see a wound and his shirt is not torn. In the following shot we see both the wound and the tear in the shirt.

Continuity: When Kane tries to persuade Mart Howe to join him, Mart's cigarette and the smoke raising in front of his face disappears between shots.

Plot hole: Frank Miller sets fire to the stable Kane is hiding in; when he leaves it, you can see the large column of smoke. But the fire is ignored after that. In an age of wooden buildings and poor fire equipment, that could have burned down the whole town. Even assuming that people wouldn't come out to fight the fire during the gun battle, you'd think that when they all came out at the end, someone would have pointed out they had a major fire to deal with.

Continuity: When Kane goes to Sam Fuller’s house his vest changes back and forth between unbuttoned and buttoned.

Continuity: In the scene where an exhausted Will Kane raises his head from the desk the star on his vest disappears and reappears.