A then unknown Suzanne Somers doubled for Carol White during the climax atop The Top the Mark hotel bar.
According to LA Times, producers originally sought Marlo Thomas, Candice Bergen or Jane Fonda for role that went to Carol White.
During the title sequence, the bus that Cathy is on going from the airport to the city is Interstate 880 in Oakland, CA. This is the same freeway which would collapse during the 1989 Loma Prieta earthquake.
Film debut of Scott Hylands.
Ironic climax of plot - a thriller about a woman who aborts a baby, then is stalked by ex-lover who is determined to kill her baby by her new husband - involves a theater where the featured play is Medea, Greek tragedy about a woman who kills her own children.