Larry Storch makes his last of four appearances as Duke Farentino.
Doris mention the Nob Hill neighborhood of San Francisco. Nob Hill has historically been an area where San Francisco's elite upper class reside.
As of 2021 it's still one of the most expensive real estate markets in the USA.
Duke mentions the lady on the TV that says "Que Será Que Será" mispronouncing it as "Kay Sarah Kay Sarah." This is obviously referring to Doris Day as part of a running gag in the series where both Doris Martin and Doris Day exist.