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The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. It is assumed that no one who is diligently avoiding spoilers will be visiting this page in the first place.
The title is shown in the opening shot as "Sunset Blvd.", stenciled on the curb of the actual street (in the gutter, if you want to consider the symbolism). It is also listed as "Sunset Blvd." on its Library of Congress registration. However, it is very common to find it listed with an unabbreviated "Boulevard", and was named as such in its original trailer.
Queen Kelly, which was partly directed by Erich von Stroheim. The movie was financed by Joseph P. Kennedy, who fired von Stroheim when the movie ran way over budget, exasperating both Gloria Swanson and Kennedy. Another director was hired to complete it, but von Stroheim was able to prevent its release. It was not seen by the public until after Sunset Blvd. was released.
No - an office building occupies the location now.
Buster Keaton, Anna Q. Nilsson, and H.B. Warner.
A 1929 Isotta Fraschini Tipo 8A Castagna Transformable that belonged to socialite Peggy Hopkins Joyce, who got it as a gift from auto magnate Walter Chrysler. (See http://en.wikipedia.org/wiki/Isotta-Fraschini.)
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