Other mistake: The excavator with the rotating bucket wheel that is shown in the opening is turning backwards from the direction required for it to actually dig.
Continuity mistake: When the Indian agent is killed, a very 20th Century rubber-tread shoe print is visible in the dirt beside him. When Cheyenne arrives and finds the body, though, the footprint has disappeared.
Old Scores - S2-E17
Continuity mistake: In the scene where Shaddock is shot in the arm you can see that the wound moves from near his elbow to his shoulder.
The Crossing - S1-E4
Factual error: The Dutton camp as well as Shea Brennon and Thomas are using modern thin Teflon/non-stick coated coffee mugs/pot.
Other mistake: The Lakota is attacking a small group of white men. One is face down on the ground, and he lifts his head to cut his throat. In the background are two cowboy actors joking and twirling their guns. One drops their gun and picks it back up. (00:20:43)
Visible crew/equipment: As the old Indian sets fire to burn his dead son, he walks towards Cain and on the left you see a fire extinguisher. (00:10:04)
Continuity mistake: Garrison begins destroying the schoolhouse/saloon walls with an axe, knocking over a whiskey bottle on the bar. When he overturns the bookshelf, the bottle has disappeared. (00:42:30)
Factual error: The show is set in the 1860s. However, in several episodes, trail boss Gil Favor can be seen wearing Wrangler jeans. The Wrangler brand was not introduced until 1947.
Other mistake: Gene enters his ranch house and tells Pat, "I picked up a letter for you at the post office - special delivery." A special delivery letter would have been taken to the addressee upon receipt. It would not be left at the post office.
Visible crew/equipment: In the wall mirror behind Clint Eastwood, the shadow of the boom rigging can be seen moving up and down. (00:08:00)
Factual error: Two women come into town somewhere around San Luis Valley, Colorado with ring-necked Pheasants. The pheasants were brought into US a few times (East coast, CA) but really did not get established until late 1880s and in Colorado likely in the late 1890s (eastern and southwestern). The problem is it supposedly depicts the year 1880. They would more likely may have found some Gunnisons Sage-Grouse nearby or rabbits. (00:16:10)
The Kid from Silver City - S3-E10
Continuity mistake: Roy is visited by a deputy marshal who is looking for the son of a local storekeeper. When the two men leave to visit the storekeeper, Roy leaves his hat on the kitchen table, but when he enters the store the hat is on his head.
Visible crew/equipment: When Bat arrives at the hotel to escort Lucy, the shadow of the microphone and part of the boom rigging are visible on the wall above the door. (00:17:30)
Character mistake: When the gang is watering the horses, Chris walks over to meet Mary's man friend (whom she introduces as an old friend of the family) and the mystery man tells Chris that he'd proposed to Mary long before 'Frank' when Mary's late husband was Steve.
Continuity mistake: During the ambush, young Jack, on horseback, takes off after the wagon which is carrying his wounded fiancé. The chase is long including a cut away and yet the wagon winds up only yards away from the ambush where the chase began.