Interestingly the first episode I saw was episode 5. I stumbled into a marathon of the series halfway into the first season. I watch very little TV these days. So I am almost completely unaware of new shows, see no commercials. The first scene I saw was of Don and his brother Adam at the diner. I had no idea that Draper was the central character of the show. But I was instantly intrigued by the mystery.
Of course the time period cemented by interest. I have had a life long fascination with the 60s. Plus my father is in advertising. Creating outdoor advertising. While certainly a different field, I have thought in terms of marketing my whole life.