I give props and alcolades to Bill as an entertainer and artist. However I can't say that I like his style.
To me he comes off as a failed insult comedian turned magician. Unfortunately the only real problem I have with his delievery seems to be something his act is based around. I believe that you should never insult or put down your audience. MAYBE once if you have someone heckling you, but that's it.
Bill seems content at making jokes frequently when he really doesn't need to, and usually results in targeting someone in the audience.
Other than that he's practically a god wtih his card handeling and he's responsible for revamping Sam the Bellhop and turning an otherwise toss away effect into a true miracle.
As for the shakes I think we all get those from time to time. You learn to deal with them, work through them, and for the most part they come and go. Who's to say what happend to him to cause that. He could have been rushed on set, had someone there in particular he was worried about impressing, personal problems, health issues, the possibilities are near endless.
Best thing to do is try to not think or obess too much about them if you find yourself with a case of the shakes. Just focus on getting through your set, get back stage, take a deep breath, relax, and hopefully by your next set they'll be gone!