Continuity mistake: Zeno is moving when they find him behind the general store. He is lifting his head. The shot cuts and he's not moving. The shot cuts again and he's moving again.
Continuity mistake: When Matt and Chester get up in the morning, Chester is in a chair with a blanket covering him up to his chin. Camera shot changes to Matt's point of view and Chester has no blanket as he speaks. Camera shot changes back to the prior viewpoint and the blanket has reappeared. (00:21:40)
Continuity mistake: Matt arrests two cattle rustlers and ties them up back to back in their wagon for the ride back to Dodge. The two rustlers later change positions in the wagon for no apparent reason. (00:26:00 - 00:29:00)
Continuity mistake: Marshall Dillon buries an outlaw at Sarah's place. He installs a wood cross at the grave. Sarah comes out and they talk. When she leaves, the scene cuts back to Dillon and the cross is missing.
The Fires of Ignorance - S20-E17
Continuity mistake: When the school teacher is questioning the father in court, he places a farmers' almanac on the judge's bench and walks away leaving it. When camera cuts to the judge with a clear shot of where the almanac was left, it is not there. (00:44:00)