The marriage of Gayle Hunnicutt and David Hemmings was falling apart rapidly when they made this film together, and the tensions between the characters they played were echoed by the tensions between them on set. Kevin Billington, the director, said that it was his most uncomfortable experience directing a film, adding that the situation was of no benefit whatever to the mood of the film.
The original Broadway production of "Voices" by Richard Lortz, opened at the Ethel Barrymore Theater on April 3, 1972, and ran for 8 performances.
David Hemmings (Robert) and Gayle Hunnicutt (Claire) were married in real-life, and had a son together. They divorced in 1975; two years after this film was released.
The child who briefly played David (Adam Bridge), seldom acted after appearing in this film. He had roles in Juggernaut (1974) and two episodes of Hunter's Walk in 1976, but never acted again.
The two main characters have both passed away. David Hemmings (Robert) died in December 2003, age 62, from a heart attack. Gayle Hunnicutt (Claire) died in August 2023, age 80, from an unspecified illness.