Visible crew/equipment: As the Batcoper emerges from its hangar, multiple crew and equipment are reflected in the cockpit's glass bubble. (00:04:05)
Continuity mistake: When Lucy awakens at 4:00 AM she checks on Linus and then puts him to bed. In some shots there's a window over Linus' bed, but in other shots the window has vanished, and there's only a shelf over the bed. (00:23:10)
Continuity mistake: When Blondie abandons Tuco in the desert, watch the rope around Tuco's neck. It changes between shots, sometimes over his left shoulder, and sometimes hanging down in front of him. It is not due to the camera angle.
Revealing mistake: When the stagecoach driver gets hit with an arrow, it springs up from below into a horizontal position. (00:33:55)
Continuity mistake: Sidney kisses Alva as she tells him the dream of going to New Orleans. She has her handkerchief in her right hand, suddenly clutching it to her chest with the left. And she is holding it against his arm with the right as the angle changes again. (00:23:20)
Visible crew/equipment: During the flashback scene in the clock courtyard, there are multiple T-marks (plastic type) visible on the ground, near Col. Marcus and Gen. Randolph. (00:16:20)
Continuity mistake: When Don Knotts is in the old Simmons mansion, he falls down a chute of some kind. If you watch closely you will see the stunt person looks nothing like Don Knotts. It is a younger man with very straight hair.