i got cross and turned over during the dream sequence
Brown was just using the same technique as a stage hypnotist
The guy is "highly suggestable"
what this means in the real world is that the guy knows full well he is taking part in a TV show – but is willing to play along with the charade. He is fully aware of what is going on, the important part is that he can be relied upon to do what is expected of him and "play the game". At some point he will have signed a disclaimer saying he gave Derren Brown permission to mess with his life – so he will be ready for anything unusual that might happen to hime after this point, and realise that its all just a TV show.
People who take part in stage hypnotist shows are the same – they are not hypnotised, they are just extroverts/ show offs who are happy to play the role of the idiot doing stupid things on stage because a hypnotist told them to