Trivia: Val Kilmer has been quoted as saying that screenwriter Kevin Jarre insisted the actors wear real wool costumes, in accordance with the time period. During the scene in the Birdcage Theater, Val Kilmer says, a thermometer was placed on the set, and it read 134 degrees Fahrenheit. Kilmer suggested jokingly that this was the reason Doc Holliday killed so many people: "It's just, like, he wore wool in the summer, in the Arizona territory, and that made him mad."
Trivia: 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".
Trivia: 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.
Trivia: When Wyatt is at the train station standing on the loading platform, giving Ike Clanton his "you tell em' I'm comin', and hell's comin' with me" speech, really going crazy on Ike, he's standing in front of train car 5150 (the California police code for a crazy person).
Trivia: Just before the famous O.K. Corral shootout, Wyatt retrieves his gun from home. The gun shown is a 12-inch barrel Peacemaker, but Wyatt received a custom 10-inch version from the people of Dodge City. The armourer who supplied the guns for the film could not find a 10-inch specimen, and therefore used a 12-inch version. This fact was stated in an issue of Guns and Ammo magazine. Incidentally, the man who plays Texas Jack was the technical consultant on the film.