Being a film of mostly former A-list guest stars like Sue Lyon and Elke Sommer, character-actor Frank Ashmore, who plays the central killer/antagonist, is far down in the credits. In fact, his name shows up in the middle of a "stack" of names. This could be because he was one of the few unknown actors in this film, or the fact he's invisible a lot of the time.
This movie was shown at theaters for a week and went directly to TV right away.