Factual error: The train that pulls into Newton Station with Confederate soldiers has freight cars of modern construction. This can be seen by the newer type trucks, unlike the 'arch-bar' trucks of the period.
Continuity mistake: When Rick Nelson tells Angie Dickinson to throw the plant pot through the window to distract the gunmen who threaten John Wayne he seems to have had a hair cut between scenes as his sideburns are halved by the time he reaches the street and grow again later.
Visible crew/equipment: Michael Pate is walking down the street in this western and as he passes a shop window you can see all the camera crew, the director, the arc lights etc.
Continuity mistake: The party decided to leave the station. Brigade sets the horses free. Mrs. Lane has something to say about it; as she calls Brigade by name, Boone in the background turns around between shots. (00:20:15)
Continuity mistake: When Sam is counting to five when riding his horse, he runs into a telegraph pole and loses his guns in the process. But when he catches up with Bugs on the train, he is holding his guns again.