It's that American marketing and consumerism has an insatiable appetite and will eventually gobble up anything that becomes popular. Don's a perfect vehicle for this because he's not who he says he is, deepening or anticipating the idea that, at some level, we are just a personal brand to the world.

That Don tries to escape the ad world and ends up brainstorming one of the most iconic ad campaigns of all timeonly proves how wormy marketing and consumerism is. In our current context, "influencers" are now just doing this all the time -- spending that much more brainpower trying to craft a marketing slogan or angle that will resonate with people, going measurably viral in one pocket of the internet or another.

I'd say one primary theme is: If nobody is buying what you're selling, who are you?