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: During a shootout at the end of the movie, one of the gunmen with a rifle is wearing a wristwatch. (02:58:30)
Continuity mistake: When Wyatt meets Doc for the first time, the amount of liquid left in Doc's drink keeps changing. (01:21:32)
Continuity mistake: When Wyatt, his brothers, and Doc are walking to the OK Corral, they are walking side by side. In several shots, they go from walking in the shadows to in direct light, especially Doc Holliday. Also, Doc's right arm keeps going from being up at his chest with his hand in his jacket to down at his side. (02:20:12)
Continuity mistake: When Wyatt is confronted by Ed Ross in the bar after refereeing the boxing match toward the beginning of the movie, he has a pistol in his belt when throws the cue ball at Ross. Wyatt still has the pistol in his belt when he takes Ross' gun and holster and straps them on. But when he and Sally walk outside right after, the pistol that was in his belt is gone. (00:27:50)
Continuity mistake: After the wagon chase shoot-out where Wyatt tells Dutch to shoot the lead horse, Wyatt is standing on top of the wagon holding his rifle. In one shot, the barrel is up in the air; then in a quick shot of his legs before he jumps down, the gun is pointed down. Then in the next shot, as he's jumping down in a close-up, it's pointed up in the air again. (00:18:56)
