The Rex Montana Story - S1-E35
Revealing mistake: When Flint follows the Indians, there's a strong wind blowing. But the two puffy clouds in the backdrop sky never move.
Three Bells to Perdido - S1-E1
Visible crew/equipment: When Paladin talks to the ranchers, two equipment shadows are moving on the wall at the upper left of the screen. (00:03:00)
Visible crew/equipment: In the wall mirror behind Clint Eastwood, the shadow of the boom rigging can be seen moving up and down. (00:08:00)