Revealing mistake: At the beginning of the episode, as Jim West walks away from the newsstand vendor and closes the magazine, a 1967 ad for DieHard batteries ("The DieHard Fights the Common Cold") can be seen on the right-hand page of the prop magazine, in a modern sans serif font.
Continuity mistake: West uses a chandelier to knock down a thug wearing a brown vest against the opposite wall in the Saloon. When West gets up, the thug is now lying next to West and wears a green vest rather than brown, and is also closer to the Saloon's bar.
Factual error: West and Artie are trying to move a cabinet from the wall. A closeup shot shows West's left hand entering from the right side of the shot to press a button that allows a secret panel to open. Unless West twisted his left hand 180°, then him pressing the button as shown is not possible.