The Draper’s dog (acquire in Marriage of Figaro) is Polly.

Hollis is the elevator operator who helped Don in Red in the Face

Sonny from the elevator and a janitor got fired the morning after the election (Nixon vs. Kennedy).

In 5G, Ethel had made breakfast. She is the same babysitter as in Shoot. Carly is the part-time help of the Drapers in the Wheel.