The real Wyatt Earp's six-shooter was loaned by the Earp museum and used in some scenes during a number of close-ups.
Gene Hackman receives third billing and is named on all posters although he has barely 10 minutes of screen time.
Kevin Costner commandeered every western costume in Hollywood for this film, forcing rival production Tombstone (1993) to import costumes from Europe.
Michael Madsen (Virgil) was offered the role of Vincent Vega in Pulp Fiction (1994) but had already signed on to appear in this film and was under contract. According to Madsen, he would have been able to appear in both films if the producers had released him from the rehearsal time, but they refused.
Jim Wilson: Film's producer appears as Virgil Earp's doctor. Wilson also appeared as a doctor in Dances with Wolves (1990).