The actress who plays Lou's girlfriend (Sheree North) went on to play Kramer's mother, Babs Kramer, in Seinfeld.
Lou tells Mary: "Who cares? In 50 years, we'll all be dead." This came true. This was filmed in 1974. The last remaining principle cast members died 47 years later. Cloris Leachman, Gavin MacLeod, Ed Asner, and Betty White all died in 2021.