The aptly named policeman Capt. Green was not actually supposed to have a green face--the make-up under fluorescent lights made his face look green.
Cast members Chuck Katzakian, Phil DeAngelo and Ray Rustigian had performed for years at a dinner theater in Stockton, CA.
The actors who played the death machines all did their own stunts.
The mysterious mastermind man was kept in the shadows in case there was a sequel so that another actor could fill the role if required.
Director Paul Kyriazi was also a stunt driver in one scene, as he did not want to put anyone at risk.