In Chapter 8, Ramon (Walter Miller) is tied up and put into the wagon head first. Then he is shown facing the opposite direction with his head facing to the back of the wagon.
In Chapter: 1, Ramon is shown cutting out a piece of the WANTED poster. This scene is repeated again in Chapter: 12.
At 3:42 minutes into Chapter 6 watch for the car driving by in the upper right. This happens when Delores and Maria, on a wagon, enter through the archway to Shumway's place. This is suppose to be the old West, before cars.
An unplanned fall in Chapter 5, Buzz falls off his horse when it is suddenly startled by the sound of a gun shot. This fall wasn't suppose to happen. It should have been edited out but was left in the movie.
When Jenkins (Bob Kortman) pours the poison into the mine in Chapter 7, he pours only a jar full. But the amount of poison dust in the mine and outside is way more then the jar could have possibly made.
Dolores Valdez (June Marlowe) is shown through the whole movie wearing a riding pants outfit, but in Chapter 11 she wears a dress. Seems out of character.