Cheetah is actually the large-sized feline that inhabits across Africa, Asia and Middle East. These cats are by far the fastest runner on land in the animal kingdom. This article demonstrates you exactly how fast can cheetahs run.
Mae Questel was a actress and singer who was most associated with Betty Boop. At the age of 17 she won a contest imitating Helen Kane as sponsored by Kane. Later Mae would impersonate stars from the 30's from Fanny Brice to Eddie Cantor.
Sulley nicknamed her Boo, but her actual name is Mary (seen briefly in a picture in the film). The picture with 'Mary' was actually drawn by Mary Gibbs, the actor who played Boo and was incorporated into the film. Boo's actual name may well be Mary though. The Internet Movie Database only lists the character as Boo.