He is also the lead singer for Oingo Boingo, and Oogies lair is decorated with the trademark Oingo Boingo Skelletons. Glenn Shadix - Voiced the Mayor, and played in Burtons Beetlejuice as Otho. Catherine O' Hara - Voiced Sally, and Shock, and was the Mother in Beetlejuice. I'm sure there are others, those are just the actors that I caught. I read in an interview with Danny Elfman that Calloway was one of his idols, and the imitation was done on purpose as a sort of tribute to the late entertainer.
Witch hazel is another poisonous plant, like the deadly nightshade.
I don't think so, becuase no one in Halloween town wants anything to do with him. Besides, Oogie Boogie is evil, but Jack and his friends are just having fun. As per usual, the soundtrack of The Nightmare Before Christmas has slight differences than the actual movie track. Well, The Nightmare Before Christmas has an entire track that's not featured in the movie. It's a very very awesome track and I don't know why it's not in there - probably time and space restrictions.