Contract disputes between Laughlin and various producers caused the film to change hands between three different film studios, and delaying its release for three years. In 1973, Laughlin filed a fifty-one million dollar lawsuit against Warner studios for "improperly publicizing" Billy Jack.
The unusual kick that Billy Jack uses in the fight in the park is known in Hapkido Karate as an "Outside Crescent Kick", a technique in which the leg is raised and swung outward striking with the outside edge of the foot.
The Hapkido fights in the film were choreographed by Hapkido master Bong Soo Han. Master Han not only choreographed but also body doubled for Tom Laughlin in the fight scenes.