One last thing I loved in Monday's Mole: all the shots of Mark and Clay in their room, Mark blabbering on and Clay facing away from him going "uh huh, yeah, yup, totally, you're right." As we all should know, I love Mark, but he's so high-strung and paranoid and game-obsessed that he must be totally annoying to room with! (Especially for Clay, who's kind of a robot. I mean that in the best way.)
My theory is also that either Mark or Clay is the Mole, and the other one knows it.