This was the first (and only) time that Joseph Cotten and Katharine Hepburn appeared together since they starred in the original Broadway production of "The Philadelphia Story" in 1939.
The play "A Delicate Balance" won the Pulitzer Prize in Drama in 1967.
Kim Stanley suffered a nervous breakdown shortly after filming began and was replaced by Kate Reid. Stanley wouldn't make another film until Frances (1982).
Adapted from a play by Edward Albee. The original Broadway production, starring Jessica Tandy and Hume Cronyn, opened at the Martin Beck Theatre in New York on Sept. 12, 1966, ran for 132 performances and was nominated for the 1967 Tony Award for the Best Play.
Marian Seldes won the 1967 Tony Award (New York City) for Supporting or Features Actress in a Drama for "A Delicate Balance" for her portrayal of Julia.