• The film's controversial nature led to a prologue being added during post-production, explaining that there was no connection between Mongolism and psychopathic behavior.

  • The whistling theme from the score was resurrected in Quentin Tarantino's Kill Bill: Vol. 1 (2003). Daryl Hannah's character Elle Driver is whistling it as she enters the hospital.

  • Much of the interior house footage was shot on location at the Mills family home in Twickenham.

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