Continuity mistake: Heyes and Curry walk into the saloon covered with trail dust from head to toe. But when they leave, Heyes' hat is spotless. (00:06:10 - 00:08:30)
Visible crew/equipment: When Heyes and Curry leave the saloon and walk across the street, a microphone mounted on the camera rigging pops up into the shot at the bottom of the frame and follows along beside them. (This is visible in the US aired and vhs versions, but was edited out of both the BBC version and the recent dvd release.) (00:14:00)
Revealing mistake: At Armandariz's hacienda, a power cord is peeking out from behind the large chest against the wall in the main room. (00:18:00)
Continuity mistake: While he's working to open the safe, Heyes is wearing his coat. Then he isn't. Then he is again. (00:19:20 - 00:20:30)
Continuity mistake: In his showdown match with McCreedy, Heyes deals out five cards in each row on the table. But in the next shot, there are six cards in each row. (00:31:30)
Plot hole: Early in the episode, the sheriff starts going through his pile of wanted posters. According to the story line, 18 days then pass. At the end, the sheriff, standing in the exact same position and wearing the same clothes, is just finishing his search through the posters.