Corrected entry: Blake spies on Heyes, Curry and Louise as they sit together on the picnic blanket. But in the view through his telescopic gunsight, Louise is missing. When the shot returns to the camera's normal POV, she's sitting right between Heyes and Curry, where Blake's sight couldn't possibly have missed her.
Corrected entry: When the posse traps the bank robbers in the livery barn, the doors on both ends of the building slide shut, meeting in the middle. But in the exterior shot, as they all exit, one of the same doors that slid shut a moment before now swings open on hinges.