After delivering a message to Peggy, Joan states "you know what they say 'the medium is the message'". This is a reference to Marshall McLuhan's popular phrase, originally coined in a book published in 1964. Joan's use of this phrase is an anachronism, as the first season is set in 1960.
The song played at the end of the episode is "Babylon", a folk song released by Don Mclean on his album "American Pie".
Actress Talia Balsam makes her first appearance in this episode, playing Roger Sterling's wife, Mona. The daughter of actors Martin Balsam and Joan Van Patten, she and John Slattery are married in real life. She was previously married to actor George Clooney.
One of Don's underlings: (About Peggy during the lipstick brainstorming session)
Joan: Roger, if you had your way, I would be stranded in some paperweight with my legs stuck in the air.
Don: Mourning is just extended self-pity.