Actress Jane Merrow confused the Smith and Jones aliases and called Pete Duel's character "Jones" in one scene. Duel saved the director a retake by ad-libbing back, "It's Smith, sweetheart." The exchange was left in, but still looks a bit odd, since Merrow's character had kept their names straight without any trouble in earlier scenes. See more...
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Factual error: Kyle strikes a match on the wooden floor to light the dynamite's fuse. In the early 1880s (the era in which this series is set), a portable flint-and-tinder kit was the common method of sparking a light. While "strike anywhere" matches had been invented by this time and were quite the rage in Europe (despite an alarming tendency to explode due to the volatile chemicals used), they were an unknown commodity on the American frontier until well after the turn of the century.
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.)