Dennis Quaid lost over 30 pounds to play Doc Holliday, who suffered from tuberculosis.
Tombstone (1993) was being filmed at the same time nearby, and bought up most of the period clothing in the region. Clothing had to be imported from Europe, delaying production.
Michael Madsen was offered the role of Vincent Vega in Pulp Fiction (1994), but he couldn't get released from this film.
For the movie, Wyatt Earp's actual 6 shooter was loaned by the Earp museum and used in some scenes during a number of close-ups.