The famous 'Hollywood' sign is on Mount Lee, not Mount Hollywood, and was originally an advert for real estate?
The ghost of Kabar, Rudolf Valentino's Great Dane, is said to haunt the LA Pet Cemetery. It's a friendly ghost however, and has been reported to lick people and pant a lot.
Hollywood almost became known, rather unglamorously, as 'Figwood'. Harvey Henderson Wilcox, owner of the acres upon which movie studios were later built, wanted to name his farm after its major produce of figs.