All the shots of the killer on the prowl on the streets of Los Angeles were filmed without permits.
Nicholas Worth consulted a criminal psychologist to research his role as the killer, and improvised a lot of his dialogue.
Made under the title "The Hollywood Strangler."
Flo Lawrence and James Westmoreland didn't get along during the shooting of this film. As a direct result of this, Lawrence ate a bunch of onions and Westmoreland refused to shave on the day that their love scene was shot in order to make said love scene harder on one another to do.
The line "Adios creep" was improvised on the spot.