He uses the same routines that spiritualists and mediums use. It is quite easy to do. I have posted before about being persuaded into being 'Madame Zelda' for a village fete. I read a book, DSis and I practiced for a week or so, and went on stage, we were quite good.
So that part of the show is all down to preparation and very, very old 'cold reading' techniques.
The rest is down to people going along with the show, agreeing to become confederates. Or being too scared once the legal threats start to roll in.
A quick Google will find you quite a few sites that debunk him. They aren't all that interesting, what is interesting is that there is a pattern to the responses:
A question is posed.. how did that happen
An answer is given: well, it was fun, I knew what I was doing but it seemed polite to go along with it. He started off 'hypnotising' me, but soon changed to just giving me directions, which I followed
Someone comes along who knows a participant, they really didn't know how that happened, then
Someone argues that that is a daft thing to say and that person insists they know someone but that they won't talk about it.
If the site has too many identifying features it disappears as the legal threats roll in
If it hasn't got too many identifying features more and more weird, hate filled posts arrive. As do more people who have been on or know someone who has but are really vague about the experience.
All in all, it is, as you might imagine, nothing more than a bloody good wheeze, some old fashioned carny tricks, a well thought out story line and a host of good lawyers.
What else would it be?
Magic?