* ActingForTwo: In addition to the role of Billy the Kid, Emilio Estevez dressed up as one of the enemy combatants in the [=McSween=] shootout at the end.
* DeletedScene: In the audio commentary Casey Siemaszko reveals the prostitute Charlie goes to see was actually a longer scene, and the end of the scene he tells the guys the woman was his mother.
* EnforcedMethodActing: Lou Diamond Phillips is afraid of heights. That's why he moves so slowly on the 30-foot high cliff.
* IronyAsSheIsCast: Creator/CharlieSheen was reportedly a terrible horse rider. Throughout the shoot he couldn't keep his balance on the horse and fell off several times. After the shoot out with Henry Hill, his horse took off and he had no clue how to make it stop.
* RealLifeRelative:
** Emilio Estevez and Creator/CharlieSheen costar.
** Baker, the guy who gets knifed, is Jack Palance's son Cody Palance.
* WhatCouldHaveBeen: The movie accounts for one of the very few Music/JamesHorner scores to be thrown out and unused. Westerns don't seem to have his ideal genre (''Film/TheMissing'' wound up ending his working relationship with Creator/RonHoward).
* WritingByTheSeatOfYourPants:
** In the scene where Billy is having Doc write a letter to the Governor, Emilio Estevez wanted to make it look like he was making the speech off the top of his head, so the crew made a cue card for him to read. If you look closely, you can actually see his eyes moving while he is reciting the speech.
** None of the movie's fight scenes were choreographed. The actors just improvised.