It’s certainly a shock to have Mary return from the dead. It’s probably a shock to see her with a new haircut. Clearly, Dean has a lot on his mind… or he’s just thinking about what kind of pie he wants for dinner.
Castiel: It's very complex. If the pizza man truly loves this babysitter, why does he keep slapping her rear? Perhaps she has done something wrong. Dean: Are you watching porn? Why? Castiel: It was there. Dean: You don't watch porn in a room full of dudes. And you don't talk about it. Just turn it off. Well now he's got a boner.