Tricks that can amaze people are always fun to learn, but not everyone teaches.... lol, that video was quite cool though.
On the coin one, im pretty sure that ring has something to do with it, watch the second time he waves his hand over it, it goes right over it, soon as he moves his hand, he closes the fingers including and around the ring finger. dja
The coin thing I'm not sure how but I think the salt thing had two layers of glass or something. I'm probably wrong but that's how it looked to me. Pretty cool. Wish it was 100% in english though.