After Guthrie disarms the arresting Marshal and takes his horse to ride back into town, he arrives on a totally different horse. The horse he arrives on is much darker with distinctly different coloration.
In the final shootout, Dana Andrews is shot in the shoulder. When the shootout is over, there is no blood from the shoulder wound and Andrews acts if nothing happened.
Multiple overhead electrical power lines and a pole are visible in some scenes out at the ranch.