Good question, I am interested in his stuff alot too...
Search www.google.com for like NLP / Influence / Eye Cues ... Theres ALOT of them... Hes like a proffessional psychologist and he adds more things, very clever guy.
Its all about reading different types of people...
For example cold reading - you can just walk past somebody in the street and have a CLUE to what their job might be, you can tell this by the way they walk, wear their hair, what they wear, facial expression, how they do everyday things etc...
Heres an example I read once on a body language website (
http://www.channel4.com/culture/microsites/B/bodytalk/ ) ...People who light up a cigarette and cover it with their hands even inside tells us that chances are that they have a job working outside.
I am looking alot into this becuase like you, I want to know all this stuff and how it works...
Its just all about peoples behaviour