Although credited, John Slattery (Roger Sterling) and Robert Morse (Bertram Cooper), do not appear in this episode.
(I Can't Get No) Satisfaction, by The Rolling Stones
Bethany: (to Don) So, are you a Felix or an Oscar?
This is a reference to the Broadway play, The Odd Couple. It would also be made into a popular TV series about five years later.
Peggy: (watching the men try to figure out the snack machine) I feel like Margaret Mead.
Margaret Mead was a renowned anthropologist who focused on broadened sexual views.