I've been thinking the same thing! And it's really been more apparent in these last 2 episodes. OTHoaP: Sam KILLS a demon (and not just ANY demon) in front of Castiel, who isn't quite fond of them in the first place, and then no one mentions it again-- Sam exits episode 30-ish mins in after a kick*ss demon showdown and a 'miracle' talk with Castiel. IaTL: Did sam go back to normal when Dean did? Or did Zachariah have to go find him later? First time I watched it, I was quite sure Sam was just all part of the illusion to make Dean realize he needed to keep hunting. :S