Director Fritz Lang and cinematographer Nicholas Musuraca developed a revolutionary dolly for the camera that allowed for sustained tracking shots and intimate close-ups while shooting this film. Lang preferred the practice of tracking into a close-up shot of an actor as opposed to cutting to a close-up in editing. He believed the tracking close-up captured more of the actors' intimacy and emotions.
Richard Conte and Ruth Storey, who play prominent roles in this picture, were married in real life at the time.
The film was completed in just twenty days.
Sally enjoys reading bloody thrillers written by Mickey Mallet - a spoof on Mickey Spillane, whose novels featuring Mike Hammer are just as gruesome as those Sally describes.