While the store proprietor reads a note written by John Brant, there is a sudden brief cut for no apparent purpose to the exact shot of Brant and Conlon riding into town which was used a few moments earlier, before their visit to the store.
When John and Joe go to rob the store at night, there is a shot from inside the store through the door that blows off a piece of wood on the outside of said door. Then when the sheriff opens the door, there is no wood missing on the outside, just a bullet hole.
When Sally reads the last line of Brant's warning note, the word 'or' is missing from the beginning and there is no sign of the preceding line.
Multiple "modern" utility and power poles seen throughout the gunfight and chases at or around the mine towards the end..
The locomotive and track switch equipment seen at the beginning of the film is the kind not seen until the 1920's or 30's.
Shadow reveals camera and moving crew member.