The slightly disengenuos piece in the first question is the inference that Matt didn't know the process he's going through. As Matt is a long time fan and goes to Derrens stage shows and leaves messages on his blog saying "Pick Me!" thats pretty much an outright lie by Derren.
Its also an inherent weakness in last nights show in that, similar to the criticism levelled at later Big Brother shows, I think exposure to previous shows has taught Matt how he ought to behave, and this level of self consciousness in his participation ruined the show.
And thats nobodies fault but Derren and his production staff, they should have looked at some of the first takes and politely said "no thanks" and got somebody a bit fresher.
Matt is not an ordinary man of the street, he is an avid Derren Brown fan--thats a heck of a difference. Especially if you want somebody to collapse like a ton of bricks when you touch their forehead.
For me an audition process is as good as somebody being a stooge.