- Actor-Shared Background: Penny Irving was a glamour model like her character Anne Marie.
- Banned in China: The film is banned in Norway.
- Completely Different Title:
- France: Flagellations
- Italy: And Traces of Violence on the Body
- Sweden: The Penitentiary
- Fake Brit: Sheila Keith was Scottish, putting on an English accent to play Walker.
- Fake Nationality: Penny Irving is British playing the French Anne Marie.
- Playing Against Type: Sheila Keith did a lot of comedies at the time, and Pete Walker decided to cast her against type as a sadistic prison warden."I don't know if you've noticed but comedy actors make terrific villain."
- Production Posse: Sheila Keith (Walker) also starred in Pete Walker's films Frightmare and The Confessional.
- Technology Marches On:
- The truck driver who picks up Anne Marie unwittingly sends her back into the prison by mistaking it for a private clinic. If it were these days, he'd be able to use a GPS to find the nearest hospital or else call an ambulance on his cell phone.
- Julia asks to use the kitchen phone and discovers Mark, thus setting up the climax. Again, with a cell phone...
- Margaret Wakehurst was a real prison governess that existed in the 1800s and got fired for cruelty towards the inmates.
- Margaret's Dragon is named Walker, after the director himself.
- Word of God: Pete Walker denies that Margaret Wakehurst and Justice Bailey are deliberate caricatures of Mary Whitehouse and Lord Longford. He says that there was a little inspiration, but Mary Whitehouse was a kindly librarian sort as opposed to the ruthless zealot Margaret was.
- What Could Have Been:
- Alfred Shaughnessy, of Upstairs Downstairs fame, wrote a treatment but he was too busy with commitments to the TV show to write the full screenplay.
- The film was originally envisioned as a straight Girls Behind Bars flick, but Pete Walker read about a Victorian prison governess who was fired for excessive brutality and that helped form the story.
- Peggy Cummins auditioned for the role of Margaret Wakehurst but was turned down for being too attractive.
- Pete Walker's Frightmare was originally planned as a sequel to this, before evolving into an original story.
Trivia / House of Whipcord