When the Indians appear on the ridge, they are standing in a row. The one at the right side can then be seen walking towards the left and bending over to put his spear down. When the camera comes back to looking at the ridge a few seconds later, he has returned to his original position.
The pistols that Samuel and Straight use in their duel look like Colt Single Action Army revolvers, that would have side loading gates and ejector rods. BUT they have swing out cylinders rendering those mentioned items unnecessary. NO firearm needed both sets of loading/ejecting and in fact NO such firearm did have both sets.
When Annie falls from the wagon she is clearly wearing nylon, seamless hosiery, something not available in the Old West.
When Annie is thrown from the wagon her undergarments can be seen, a panty girdle, a shaper, or a leotard. Such an tight fitting garment for women did not yet exist for women in the late 19th Century.