When Steve knocks the second gunman over as he jumps off the horse, the man drops his rifle so that he can use both hands to try to fend off Steve's tackle. Yet in the next shot of the two men tussling on the ground, the bad guy has his rifle again.
When Steve is racing his horse, the horse starts out with white stockings. During the race they briefly change to black. When the race is done, they are white again.
Steve's footwear changes during his ride with Suzie --from a light gray cowboy boot at the start, to a light gray sneaker as he takes off on foot after Suzie and her spooked horse, and finally to a darker brown boot as he is catching up to Suzie and the horse.