Billy Jack kicks Posner, and Posner's hat lands flat. In the next shot, the hat is on its side.
During the shy young girl's performance of her song for her brother, there is no guitar capo from the front view, however the rear view camera shots show a capo.
In the barber shop, the hands of the barber on the customer's head don't match up with his reflected position in the barber shop mirrors.
During the snake ceremony, Billy Jack's shoes change from moccasins to sneakers and back.
While Carol sings "Johnnie" in the Freedom School's auditorium, a capo is visible on her guitar's second fret in rear shots, but not front shots.
The quote read at the town meeting and attributed to Adolf Hitler was originally published in a minor Communist magazine. In the 1960s, the quote was used by the radical media to advance the anti-war cause. It was also quoted by public figures who sympathized with the movement, including Senator Edmund Muskie and Supreme Court Justice William O. Douglas.
Billy Jack tells Bernard to drive into the lake and he does so. Although partially visible, the emergency brake is up when Bernard is at the wheel.
When Billy Jack performs a spinning back kick against one of the "boys" attacking him in the park, the face shown is clearly not Tom Laughlin's. It's his body double, Hapkido expert Bong Soo Han.
The beginning credits include a shot taken from the view of someone riding a horse. The shadow clearly shows that whoever is riding the horse is also holding the camera.
Martin credits the Serenity Prayer to St. Francis of Assisi. It was actually written by American theologian Reinhold Niebuhr, and first published in the 1930s.