tips on detecting illusions and slight of hand

i was wondering can anyone give me some advice on how to detect slight of hand with things like psychic surgeries and the like, for example here http://www.dailymotion.com/video/x1w053 ... artie_news is the work of a supposed psychic surgeon and i believe that he is just screwing around, though i cant quite put my finger on it, but can anyone give some key signs of slight of hand at work?

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