There's a lot of sub text going on. And the show represents the character of a changing America in the 60's. There are a ton of very subtle references to homosexuality, race, religion, politics in nearly every show. Also for fans of visual design, it is probably the most cinematic of all TV shows in that its lit and shot very much like a full length movie. The writing style is also very "discreet". They don't hit you over the head with things but give hints as to how a character feels. For example, last night when Don called to check up on Betty, you could tell that Henry was really steamed at her for going to Don and telling him about her tumor. This is punctuated when he tells Betty that it was "nobody" on the other line. Kind of have to think through the emotions and motivations of each character in this show. Unlike CSI or Law and Order where basically what you see is what you get.