Treasure of Silver Lake (1962)

Factual error: About 15 minutes into this western, there's a scene in a bar with a group of guys standing around drinking beer. One fellow wears a suspiciously modern looking pair of horn rimmed glasses, as well as having what looks like a modern sailing type of 'baseball' cap on his head. I would have thought that one of the crew men was accidently included, except that this fellow had a speaking role.