I just re-watched last week's episode and knew that Andrea, Don's old flame he runs into in the elevator, looked familiar, but I couldn't place her. That's Mädchen Amick, the spectacularly gorgeous woman I've seen in a few other roles, most notably opposite James Spader in Dream Lover from 1993 (although I understand she had a regular role in David Lynch's Twin Peaks TV show). She was only 22 in that film, and you see all of her, if I recall correctly. The movie is good, but I'd watch it just for her and how achingly beautiful she is in it even if the movie were not any good.
Anyway, it just dawned on me that she gets choked to death in both Mad Men (via a dream) and in the movie. Ha. Now that's type casting, or more likely a little in-joke. Of course, the homage to the Nurse Ratched choking had to have been deliberate as well. The framing and angles of the shots were far too similar to be a coincidence.