On first hearing about Peggy's big decision:
"Matt [Weiner] called me, actually, to tell me, I think because he didn't want me to read it in a script and panic. I appreciated him doing that, because I think if I had just read it, I would have gone, 'Whoa whoa whoa, what's happening?' So he called me, and at first I felt sad, because you get attached to an idea. But after about three seconds, I realized, you know what? There's no other place to go. That's the only way [Peggy] can grow."
On the money-in-the-face scene:
"That was pretty intense. Jon [Hamm] has mentioned how that was a little bit difficult for him, like throwing something at a kitten... There needed to be that kind of thing to push her over the edge. And I think Don knows that he pushed her away. And that's definitely sort of a last straw moment; at the same time, there could have been something the following week that happened that would have been the last straw."