The final “Mad Style” is going to be like Pete Campbell’s commute to Cos Cob, an epic poem. It’s coming, but you’ll have time to have several Cokes before then. To tide you over, and because we wanted to do this for the final “Mad Style” but realized the post would be too long, here are the first and last times each of the major characters appeared on the show. Reflect upon change and the relentless march of time while you wait. That’s always fun.