i agree about peggy. she's allowed to behave like don at her new job. i totally get her frustration after re-watching season 5. it's annoying to be a woman and have people treat you like you're a "bitch" when men get away with speaking frankly. i deal with that at work all the time. go peggy.
i also loved seeing betty look for the girl. i couldn't help but think of "she's leaving home", but that would have been a cheesy (and expensive) song to overlay.
i think pete is going to rise while don falls. notice that don wanted to cancel the meeting and pete said no. the meeting happened. don puking at the funeral and failing on the hawaii project also shows he is losing control.