Trivia

In a 2018 interview, Diane Franklin talked about her infamous incestuous sex scene. She said while she definitely understood the peculiarity of it, she didn't have a huge issue with doing it. "I never had a brother, so luckily, I didn't have that association or the weirdness that went along with it." Franklin did admit filming the scene did end up being very awkward, but not because of the content. It was the producers who made her nervous. Shot in Mexico with no parents or chaperones at her side, the script called for the actress to appear topless, which she agreed to because she had no issue taking off her top in front of cast and crew. She'd already done it in The Last American Virgin (1982). But when producers tried to persuade her to go fully nude, she balked and successfully stood her ground. "They said I was beautiful and they really wanted me to do it. I said thank you very much but no." Franklin laughed. "They got around it by shooting me from the back, which I had no say in. And that was that."

Jan and Mark Montelli were portrayed by real life brother and sister Erika Katz and Brent Katz.

According to an interview with George Lutz at website Horror.com, (Lutz' twenty-eight days in the real-life house provided the base for The Amityville Horror (1979)), Lutz wanted this sequel to be based on John G. Jones' book "The Amityville Horror Part II", the sequel novel which recounts the aftermath of the Lutz family escaping the house, but still experiencing paranormal events. However, producer Dino De Laurentiis, in conjunction with American International Pictures, made this sequel based on Hans Holzer's book "Murder in Amityville", which is a prequel that recounts the events that led to the DeFeo family deaths instead. Lutz sued De Laurentiis. He was unsuccessful but did manage to force them to out a disclaimer on the posters that read "This film has no affiliation with George and Kathy Lutz."

Debut theatrical feature film of actor Jack Magner whose only other screen acting credit after this movie was in Stephen King's Firestarter (1984).

The house in the film, as in the original The Amityville Horror (1979) movie, is not the actual house as depicted in the best-selling novel, as that dwelling was unavailable to shoot in for both films. The home in both movies was a Colonial style replica situated in Toms River, New Jersey.