The unusual kick that Billy Jack uses in the fight in the park is known in Hapkido as an "Outside Crescent Kick", in which the leg is raised and swung outward, striking with the outside edge of the foot.
Contract disputes between Tom 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 $51 million lawsuit against Warner Bros. studios for "improperly publicizing" the film.
The film was directed by Tom Laughlin but all literature and the actual credits claim the director as T.C.Frank. This was a way for Tom Laughlin to honor his three children: Teresa, Christina, and Frank.
Just before shooting on the picture began, several cast members tried to convince Tom Laughlin to not wear his black hat with the Indian bead band, saying they thought it looked silly. Laughlin fought back, wore the hat anyway and, of course, it became an iconic trademark of the Billy Jack character.
Debbie Shock, who played Kit, was not a professional actress when she was chosen for the film. She was the babysitter for Tom Laughlin's children. Julie Webb, who played Barbara, was likewise not a professional - she was Shock's friend in real life.
The trivia items below may give away important plot points.
It is said that Marlon Brando considered Delores Taylor's post-rape scene to be one of the greatest scenes of acting he ever saw at any time. John Travolta has said in several interviews that the same scene was a huge contributor to why he chose to be an actor.