Without even mentioning his birthday, AMC interviews Bryan Batt on their Mad Men blog.

Not surprisingly, he cites “the” scene as his favorite, saying

It shows Salvatore’s smart. He’s not going to let his guard down. It’s just instinctual that he’s protecting himself.

About research, he says

I spoke some friends and acquaintances who actually were art directors in that era about what it was like, how they had to be careful who they were. One was actually married with children and realized later that he was gay. I was lucky in that I was able to meet with people from that time who were important and very similar to Salvatore.