When Barton McClain is conversing with Sheriff Walter Sande, Leo Gordon alternates leaning on the hitching rack, to standing straight, to leaning again, then standing straight up at the finish.
During the fight between Case (Jim Davis) and Link (Leo Gordon), the stuntman doubling for the 6'3" Davis is noticeably shorter than he is.
When Jim meets Della and Case at the end of the shootout, a man in contemporary, non-western clothing is reflected in the storefront window as he walks by.
During the big shootout, Case leaves Jim in his office. At the end, Case and Della wind up on the same side of the street as the office, but Jim comes running over to them from the opposite side of the street.