In the scene where the indians are chasing the main characters towards the mission, they leave the pack mule behind. In the next scene as they enter the mission, the mule is with them.
At the 1:18:45 mark when the Indians dump the bodies of Boone and another man in front of Ben and Kelly, they are shown lying in full sun. The Indians ride away and after a close-up of Ben and Kelly the bodies are shown lying in the shade.
Indians are reputed to ride horses bare back it's obvious that the blanket on Yellow Shirt's horse is covering a saddle as not only are stirrups hanging down but he puts his hands on a hidden pummel to pill himself up.
Kelly gets injured in the left shoulder by an Indian spear, yet not long after, she shows no signs of
pain when being wrestled to the ground. At the end of the movie, her blouse doesn't even show signs of blood or damage.