Brooke Shields screentested for the role of Ivy Templeton. Shields posed for the cover art for this movie's source best-selling novel. Confirmed by Susan Swift in 2016.
According to the book, "The Case for Reincarnation" by Joe Fisher, the screenplay for this movie was inspired by an actual incident in source novelist Frank De Felitta's life. Hearing expert ragtime piano coming from his family's music room, he was astonished to discover it was being produced by his six-year-old son, who had never had a music lesson. "My fingers are doing it by themselves, Daddy!" the boy said. "Isn't it wonderful?" The experience set him to contemplating the possibility of reincarnation. Website Wikipedia states that the film's source "...book ("Audrey Rose" (1975) by Frank De Felitta) was inspired by an incident in which De Felitta's young son began displaying unusual talents and interests, leading an occultist to suggest to De Felitta that the child might be remembering a previous life."
Author, screenwriter, and producer Frank De Felitta wrote a sequel to the novel called "For Love of Audrey Rose", which has never been filmed. It was published in 1982, when The Entity (1982), adapted from De Felitta's 1978 novel of the same name, debuted.
Director Robert Wise once said of this movie: "I don't think we're going to prove reincarnation in this picture, but I'm very open to the whole possibility of the supernatural, the paranormal, the possibility of dimensions out there."
Marsha Mason told columnist Rex Reed in 1978 that she was unhappy with her character in this movie. "All I did was cry. It turned the picture into a Greek tragedy."