Goofs

It is never explained how Uvalde got a horse, clothes and boots that fit after the posse found her red dress. Clothes, and even a horse and saddle could be explained, but few men had spare boots, especially those that would fit a woman.

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.

During the train holdup, the dynamite is placed on the undercarriage of the boxcar, but the explosion comes from inside the car, blowing the doors open, while the undercarriage remains undamaged.

Cap wouldn't have been strong enough with his wounded leg to hoist a huge boulder and throw it down the mountain like he did.

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.

When Sheriff Lucas shoots the bad guy with the money and he falls off the cliff, a cushion pad is visible bouncing back up briefly in the camera frame.

When the sheriff and posse come over the hill and see Uvalde, on horseback, being chased by several Indians, the view from the top of the hill is looking down on a lush, green meadow. When the shot cuts to Uvalde, she and the Indians are on dry, barren dirt with no green grasses.

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).