The Matt Cole's tombstone reads "Died June 6, 1875". Afterward, the sheriff's notices, published by Dodge City Star, read "July 1, 1872".
During the opening, there is a race between the stage and the train. The location of the stage changes between shots from being even to the passenger car (as viewed by the passengers) to being even with the locomotive (as viewed from the stage).
About an hour into the film, when the gang pulls Rusty over the bar, his shirt is ripped open and exposes Alan Hale's girdle around his waist.
Wade Hatton is seen putting on his gun-belt and sheriff's badge in the sheriff's office, two scenes before he and a group of men are seen removing the board across the door to the office.
During the stampede caused by the gunshots, the same covered wagon is seen being knocked over twice from different camera angles about 18-19 seconds apart.
Lee Irving fires his six-shooter revolver eight times without reload it.
Dodge City was named after nearby Fort Dodge, which had been earlier named after Col. Henry Dodge. An early scene in the film inaccurately shows the city named spontaneously upon his arrival and speech in the city.
During a gunfight scene a wagon pulls into field of fire. The passengers are obviously dummies. All sit perfectly still and upright, however one of their heads wobbles about quite noticeably. It was probably decided that it would be safer to use dummies, but it's just blatantly obvious.
When Abby restrains the horses during the street fight, wires are seen leading to the horses' fronts.
In the early montage showing how violent and lawless Dodge City was, a buckboard loaded with child characters pulls into a crossfire. The child-like characters are obvious dummies dressed to portray real children.
When Flynn and de Havilland are preparing to leave the newspaper office, an extra walking by on the street outside crosses right to left, turns on his heel and walks back, obviously thinking he had gone out of camera range before turning.
The movie opens with an Atcheson Topeka and Santa Fe train making its first run to Dodge City in 1866. However, Dodge City wasn't founded until 1871, and the ATSF line to Dodge City wasn't completed until 1872.
Near the beginning of the film there is a race between a stage coach and a train. A high radio tower is visible on a hill behind the train.
The fast passenger steam locomotives of the era had only 2 large driving wheels each side. The slow freight locomotive in the film has 4 driving wheels each side. The director has had 2 of these 4 wheels painted white to simulate a passenger locomotive. The locomotive in the film is a more modern locomotive and so it is able to speed along even though it is a freight locomotive.
During the scene where the angry townspeople gather en masse outside the jail after Yancey is arrested, just above the rooflines of the buildings is seen a group of tall palm trees - certainly not native to Dodge City, Kansas, but relatively plentiful outside the studio sound lot in California.
Gloria Holden plays rancher Matt Cole's wife using a crisp Mid-Atlantic accent. This sort of proper diction would not be found anywhere in the old west as it was cultivated strictly for actors and actresses in the 20th century to ensure flawless speech for stage and screen.
Hatton tells Surrett that he'll be given free "board and room" in jail. The phrase, however, is always stated as "room and board".