Series creator, producer, and principal writer Susan Harris steps in front of the camera to play Babette in this episode and in 1.17.
Inga Swenson and Robert Guillaume went on to co-star in Benson, another comedy created by Susan Harris. In Benson, they both worked for Governor Eugene Xavier Gatling. Gatling is Jessica Tate and Mary Campbell's maiden name.
This was the only appearance of Jessica and Mary's brother, the Major's son and Corrine's birth father, Randolph.
First episode of Dinah Manoff as Elaine Lefkowitz. 10 years later she played Richard Mulligan's daughter in "Empty Nest" (1988) which, like "Soap", was created by Susan Harris.
In Quito, Ecuador Randolf is served more wine by a very old Adolf Hitler. When the Third Reich fell, a few high ranking Nazis did escape and flee to South America, mostly to Argentina, where they changed their names and pretended to be Dutch or South African. In June, 1945 (maybe two months after the fall of Nazi Berlin) the Soviet misinformation system pushed the conspiracy theory that Hitler had escaped to Argentina; by 1947 about half of all USA folks believed it.