When the Stooges and Cabot are riding off in the wagon and the 'bad guys' come up on them in the armed stagecoach, several shots from the armed stage hit the wagon even though the stage and wagon are approaching each other head-on. The Gatling gun is firing out the side of the armed stage and could not possibly hit the wagon, even when pointed as far forward as possible.
While in a wagon being chased by an armed stagecoach, two of the wheels on the wagon are shot off. Moe says, "How do you like this? A time like this and a flat tire." The movie is set in the 1870s and the pneumatic tire was not invented until 1887.