When asked to comment on David Carradine's actual martial arts skills, Chuck Norris opined, "David Carradine is every bit as good a martial artist as I am an actor."
There were no stunt doubles used for the final fight between McQuade and Wilkes. Chuck Norris and David Carradine insisted to do the scene themselves despite the protests of the producers, but director Steve Carver insisted, as well.
According to the producers, had Bruce Lee been alive at the time, he would have been offered the part that eventually went to David Carradine. Had Lee taken the part, the producers would have billed the film as "the rematch of the century".
In a panoramic shot of El Paso at around 11 mins 54 sec, there is a small traffic accident as a blue car runs into the back of a white truck.
It was long rumored that, while filming their final fight, Chuck Norris and David Carradine broke out in a real fight. After Norris felt that Carradine was kicking him too hard, he warned him not to do it again. When he did it anyway, Norris struck him in return. Carradine later debunked the rumor in his autobiography, saying that he and Norris never touched each other during the filming of that scene.