Trivia: Hospital Massacre
- Hey, It's That Guy!: Former Playboy model Barbi Benton plays Susan as an adult, while Elizabeth Hoy (who was one of the evil children in Bloody Birthday) portrays her as a youngster. Fairly prolific actor Billy Jayne also played Young Harold (coincidentally, he was also in Bloody Birthday).
- Keep Circulating the Tapes: Averted. Shout! Factory released the film on DVD and Blu Ray.
- Retroactive Recognition: The producers (Menahem Golan and Yoram Globus) later became two of the most notable indie producers of the 1980's while the director (Boaz Davidson) later co-founded Millennium Films, which is the closest to a modern-day Cannon Films.
- Working Title: Be My Valentine, Or Else...
- What Could Have Been: Originally◊ the film was to be directed by Emmett Alston and star former Bond Girl Jill St. John.