Continuity: When Wyatt (Kevin Costner) becomes the sheriff/deputy/policeman of Wichita, Kansas, you can plainly see mountains in the background - there aren't any around there.

Continuity: Throughout the entire film the wrong holsters are used. They are wearing "drop loop" holsters and they weren't invented until the 1930's.

Factual error: The movie begins at the end of the Civil War, 1865;it then moves ahead 7 years 1872 in Wyoming. Several characters are wearing gun belts with cartridges on the belt. The pistols are Colt Peacemakers probably .45 cal. The problem is that the gun & cartridge was not introduced until 1873 and would take several years to become commonplace. In 1872 the precussion cap & ball revolver which did not fire fixed cartridges was still in use.

Continuity: When Morgan is shot while playing pool he is placed on the pool table. An overhead shot shows a wide pool of blood spreading from his right side. In a subsequent shot the pool of blood is much narrower and a completely different shape.

Continuity: In the scene where Wyatt meets Doc for the first time, the amount of liquid left in Doc's drink keeps changing.

Continuity: The same Old West town was used for scenes taking place in Wichita and Tombstone.   The mountains in the background are those that surround the Santa Fe, New Mexico movie set.