David Carradine considered himself an evangelist of Shaolin Kung Fu. The abbot of the temple fictionalized in the show said Carradine had made great strides toward bringing awareness about Shaolin ways of peace.
David Carradine did not practice martial arts until after taking the role of Kwai Chang Caine, after which he practiced Tai Chi and Kung Fu until his death.
Stunt coordinator Al Leong was not pleased with his tenure on the show. He believed that production moved at too much of a breakneck pace, leaving too little time for creative development and safety standards. After quarreling with the producers and occasionally taking over script-writing, Leong wrote a letter to Warner Bros. Studios which outlined the hazards and oversights of the production. When his letter was ignored, he left the show.
Bruce Lee didn't get the job of Kwai Chang Caine because producers could not understand him and thought him too energetic for the role, Caine being soft spoken.
David Carradine developed the idea of this sequel series for 12 years. There was a version offered to him in the 80s, but rejected it due to the violent premise deal too much with guns and car crashes. There was a bible of things that they avoided in the show like car crashes.