During filming Val Kilmer and Kurt Russell became good friends. One bought a grave slot in the actual Tombstone for the other and the other bought a piece of property in the town for the other. The fun thing is that neither knew that the other had bought them anything until they exchanged "gifts".

Val Kilmer can be seen at the Casino doing his famous "coin flip" trick over his knuckles, except using a poker chip in place of a coin. He does this once in almost every film he starred in during the 80's through the 90's. It's quite impressive, and something fun to look for in his movies.

In the scene when Sam Elliott is shot and staggers into the bar and falls, when they pick him up, they accidentally slam his head into the underside of the bar.

Val Kilmer is still widely known to have done the best historically accurate portrayal of Doc Holliday. He is the same height, same build, and even uses phrases used by Doc Holliday. (ex. "I'm your huckleberry" and "You're a daisy if you do").

Every line said at the O.K. Corral shootout was actually said at the actual shootout.

Billy Claiborne is played by an actor named Wyatt Earp, who is a distant relative of the real Wyatt Earp.