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)
Character mistake: Bret fires at "John Wesley Hardin" four times, but the doctor and all the witnesses say there were three shots.
Bret: My Pappy always said, "A coward dies a thousand deaths, a hero dies but one." A thousand to one is pretty good odds.