According to director Burt Topper, Victor Buono puffed smoke into his eyes to create tears for a particular scene.
Released nearly 3 months after the real Boston Strangler claimed his final victim.
The director and Victor Buono had a strained working relationship during the production. In addition to Buono having some trouble hitting his marks properly, he objected to some of the scenes that he felt were too suggestive. For the scene when he attacked Davey Davison, it was supposed to be implied that she was nude (even though actual nudity could not be depicted onscreen at this time because of the Hays Code). Buono actually walked off the set for an entire day in protest. The scene was eventually shot with Davison having apparently just stepped out of the shower, but being almost entirely hidden by the pebbled glass shower door as well as Buono's much larger frame.
Victor Buono plays the mother-fixated Leo Kroll. Psychiatrists have theorized that the Boston Strangler had a mother fixation.
The Police Sketch Artist is played by James Sikking, later to be famous as Lt. Howard Hunter of Hill Street Blues (1981).