I can't tell if the Coke commercial was a clever way to close out the show, or the fucking worst 4th wall breaking piece of shit of all time. I had the same thought about Don getting inspiration for the ad, and it was a show about an ad agency after all. On the other hand, the episode had a lot of interesting and profound dialogue, and the nice montage to wrap it all up. Then, out of nowhere, "HEY GAIZ! DRINK SOME COKE NOW!" It was such a jarring transition that totally took me out of the sense of closure that had been built up. My initial feeling, having just finished, is that it was pretty bogus.