I've been reading vernonwells' (and successors) posts about whether "Joe knows" for some time now. Joe may know. But I have a counter-conception of this show, one that I've had since I first saw it announced.This show is produced by Stone Stanley Productions, the same company that produces The Mole. In The Mole, one contestant is a confederate of the producers. The other contestants are trying to figure out who that person is. In Joe Schmo, all of the contestants save one are confederates of the producers, and the producers are trying to keep it a secret from the one contestant. In other words, it's an exact reversal of The Mole.
In other words, I don't think Stone Stanley is trying to "deconstruct" reality TV. Instead, I think they're trying to follow an idea -- reversing the concept of The Mole -- through to its logical conclusion. (I also think that they haven't mentioned the link between The Mole and Joe Schmo to avoid any disputes with the U.K. company from which they licensed The Mole concept.)
Anyway, that's my theory, and I'm sticking with it for now.