When the bad gang finds one of Tollinger's 'gun-ban' signs at the edge of town, they shoot it up with several bullets, which is shown in close-up. But in the next wide shot (as the gang is riding away), the sign is completely intact with no bullet holes.
At the 0:45:28 mark, Robert Mitchum walks across the street wearing a jacket. In the next shot (with no time lapse), the jacket has disappeared.
At various times during the movie the gun that Mitchum keeps tucked in his waistband changes form a single action to a double action revolver. The scene where he shoots the chandelier is an example.
As Nelly is running after Tollinger, just after telling him what happened to their daughter, she yells one line which doesn't match the movement of her lips.
At the 1:01:28 mark, a shadow from the camera or boom mic can be seen moving on the wall behind the bar.