At the beginning when Major Healey is on the phone he says, "no, I'm the short, cute, dark haired astronaut", when describing himself on the phone. Actually actor Bill Daily (Major Healey) is 6'0" which is tall as compared to the average height of 5'9" for a male.
Emmaline Henry (Mrs Bellows) was only 3 years older than Barbara Eden, but 18 years younger than Hayden Rorke.
Before becoming a fixture as Dr. Bellow's Wife, Emmaline Henry's first leading role was on a show called "I'm Dickens, He's Fenster" as John Astin's wife. Strange as it might seem, she did "The Munsters" (1962) but never did John Astin's "The Addams Family" (1964). She would take time from doing Amanda Bellows to do the frightful movie "Rosemary's Baby" (1968).
Although this is Emmaline Henry's first appearance as her recurring role Amanda Bellows, it is her second appearance in the series. She first appeared as Myrt in Season 1, "Is There an Extra Jeannie in the House?" (1966).