
Factual error: 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. (01:04:47)

Directed by: Lawrence Kasdan
Starring: Dennis Quaid, Gene Hackman, Kevin Costner, David Andrews
Genres: Action, Adventure, Biography, Drama, History, Romance, Western

Factual error: 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. (01:04:47)
Factual error: Throughout the entire film the wrong holsters are used. They are wearing "drop loop" holsters but they weren't invented until the 1930s.
Suggested correction: The claim that "drop loop" holsters weren't invented until the 1930s is incorrect. The style often called the "Mexican Loop" (or Mexican Drop-Loop) holster was already in use by the mid-1870s to early 1880s, especially in the American Southwest and northern Mexico. These rigs were worn over cartridge belts and featured loops that secure the holster to the belt. https://cochiseleather.com/western-gun-leather-history.aspx.
Factual error: The movie begins at the end of the Civil War, 1865; it then moves ahead 7 years, to 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 and cartridge were not introduced until 1873 and would take several years to become commonplace. (00:18:31)
Nicholas Earp: Remember this, all of you. Nothing counts so much as blood. The rest are just strangers. (00:11:02)
Doc Holiday: My mama always told me never put off till tomorrow people you can kill today.
Nicholas Earp: Do you think you're the first person to lose someone? That's what life is all about, loss! But we don't use it as an excuse to destroy ourselves. We go on, all of us. (00:51:02)