I have three preguntas related to MJ

for number 1 i dont realy know. for number 2, his fingernails were dark because of a skin diesease he had.And for number 3, i think that is true.

1. In the American sign language it's the sign for the number 3, and it's also used as the sign for a vehicle, but that makes no sense, so maybe it's just one of MJ's cool moves... (?) He did use sign language sometimes though. Eg at the end of "They Don't Care About Us", prison version. He eg used the "I amor you" sign on stage.
2. That was because of the vitiligo.
3. Yes, that's Michael's heartbeat! ♥ (It says so in the liner notes on the album.) Btw... the lobo howls at the beginning of Thriller is also Michael!