Factual error: Lucas is wearing a pair of jeans with a large "W" stitched on the right back pocket. These are Wrangler jeans, which first went on sale in 1947. "The Rifleman" is set in the 1880s.
The Rifleman (1958)
1 factual error in End of a Young Gun - chronological order
Starring: Chuck Connors, Johnny Crawford, Paul Fix
Continuity mistake: During most of the show Billy is wearing a shirt and vest. When he starts to go outside to face his ex partner it shows him wearing the vest. When he stands up to go outside he has coat on. When he gets outside he's back in the vest.