When Gregorio unhooks Miss Kitty's horse from the wagon and leads it up towards Miss Kitty, the horse still has a full harness on it. Moments later he turns to mount the horse and all the harness is gone. He never had time to have removed it.
When Gregorio uses a rock to break the chain from his wrist, he is seen picking a rather small rock from the edge of the water. In the next shot, he is using a large rock to hammer the chain.
When the Indian is shot at railroad track and soldiers start to run towards the injured Indian, there are tractor tire tracks at bottom left of screen. They are in view as the camera is on the soldiers as they run around.