Despite the 1870s setting of the film, all of the major characters are dressed in clothing that either reflects later fashion styles, or which was clearly sewn on modern sewing machines (circa mid-1960s)
When Chad Lucas (Audie Murphy) leads the posse after the outlaws who have abducted Warren Stevens' girl he has a rifle holstered on the right under his saddle with the butt of the rifle next to the rump of the horse. He uses the rifle to fight off Apaches in some subsequent scenes. After the Apache attack Warren Stevens hands him his rifle and he mounts the horse rifle still in hand. When the scene switches, the rifle is back in the scabbard/holster. In one of the following scenes, the group ride up to a campfire used by the outlaws. The right side of Chad's horse can be clearly seen in a fairly close shot, and the rifle is not in it's holster, and Chad does not have it in his hand. Whoever on the set was responsible for seeing that Audie's gear was ready for the scene neglected to check this very important item. Once the posse starts to climb up the mountain the rifle is once again safely ensconced in its receptacle.
When the men on horses bring down a water tower, it hits the ground, spitting out water from the top, indicating it was full. When the train hits it seconds later, it breaks apart, but is completely empty.