The action is supposed to be in the summer, specifically around the Fourth of July, as evidenced by the town holding a July 4th party. But outdoor Fall colors are clearly in evidence throughout the film.
After Choctaw shoots three (of seven) rounds at Jason, the scene shifts to Milt and Dell talking for at least 20 seconds. When the camera comes back on Choctaw the smoke from the third shot can still be seen clearing from in front of him.
After buying the saddle Jason places a Lariat over the horn then picks it up & goes through the door. When he gets to the other side of the door the Lariat has moved from the horn to the strap below the horn.
Sweet's position in the final scene with the colonel varies depending upon whether it is a long shot or a close-up. In the close-up, Sweet is standing in front of the fireplace; in the longer shot, he is to the left of the fireplace.