Crew or equipment visible: As the stagecoach crosses the river at the burnt out ferry, the shadow of a camera is clearly visible on the driver's back.
Continuity: In the begining of the film, when the stagecoach is going into Tonto street, we see its shadow to one side. In the next shot the shadow is on the other side.
Continuity: In the fight between the stagecoach's passengers and the Indians, we see the same image of one Indian, with a lance in his hand, falling with his horse two times. One time shot by Marshal Curly and another time shot by Hatfield.
Revealing mistakes: In the beginning sequence when the stage is coming into town you can see that the buildings are stage facades as the camera shot is at an angle and it is clear there is no structure behind the false front.
Anachronisms: The military hats are all the porkpie-type top, squared off, instead of the accurate slouch hat as was appropriate in the 1860s and '70s.
Revealing mistakes: In the scene at Apache Wells where Chris rushes in to wake the Marshall played by George Bancroft to say his wife has run off, Bancroft and John Wayne are chained together at the ankle. George Bancroft delivers his line but moves his chained leg to far, jerking the chains around Wayne's ankle. Wayne yelps and grabs his ankle. As Bancroft turns toward Wayne to undo the chains, Bancroft is clearly struggling not to break up laughing as Wayne glares at him.