In an interview, Mariette Hartley confessed that her love scenes with Keir Dullea were so steamy that at the end of each day of filming, Hartley would go home and "transfer those affections" to her husband. On the last day of shooting, when Hartley came home, her husband said, "You know, I'm going to miss Keir."
Lee Michael's new phone number 555-2131 is the same phone number as Adrienne Barbeau's radio station KAB 1340 in John Carpenter's The Fog.