Enjoyed the clip. I appreciate that this is humorous but is it really possible to identify where people come from in the city, based on accent? In London (England, not Ontario) it generally isn't. I've never been convinced about 'Sarf London', and 'Cockney' and its derivations are not confined to their original territory.
The claim that Brooklyn natives "masticate their vowels" recalls an old joke:
Judge sees a man in the back of the courtroom eating a sandwich. Judge says, "I order the man in the back of the courtroom to cease masticating." However, the man continues eating his sandwich. The baliff then walks over to the man and says, "The judge ordered you to take your hands out of your pockets."
@stormboy: yeah, more or less. the "more" being that to the extent that "traditional" (i.e. non(-recent)-immigrant) populations still live in the areas in question (the "less" being that they don't so much), their accents are alive and well and completely distinct. brooklyn in particular is very distinctive, and still very common.
btw, i heard once that mel blanc couldn't decide whether tough guys from the bronx were tougher than tough guys from queens, so bugs bunny's accent was supposed to be an amalgam of the two.