Audio problem: At the start of the movie, when Clint Eastwood says "You're making a mistake," his lips don't seem to be moving.
Audio problem: In the last shot of the shoot-out scene at the station, we see Harmonica's carrier bag in the extreme foreground, and windmill in the extreme background. The windmill has stopped, but you still hear the wind blowing, and a few seconds before you have heard the squeaking pump. (00:13:50)