According to TV Guide, during the very first makeup test for the show (before shooting the pilot), show creator Matthew Weiner told Bryan Batt (who plays Salvatore Romano) about Sal's sex scene with a hotel bellhop - a scene that would not appear in the series until this episode.
In this episode, Don and Sal go to Baltimore to meet with the executives at London Fog. About a year after this episode aired, the real London Fog company announced that actress Christina Hendricks (who plays Joan Holloway Harris on Mad Men (2007)) would be the face of their fall advertising campaign.
Don: You ever heard of James Hoffa? James (Jimmy) Hoffa was the president of the International Brotherhood of Teamsters who was convicted of jury tampering and bribery in 1964 and later disappeared in 1975.