I'm surprised the various incarnations of George Bernard Shaw's "Pygmalion" aren't at least mentioned here (the play, My Fair Lady), since Professor Higgins is a professor of phonetics and "can place any man within six miles ... within two miles in London. Sometimes within two streets."

For video games, how about mentioning Call of Duty 4: many okay British accents, but lots of Americanisms in the accents, like "Dee-pot" instead of "Dep-ot", "Miss-le" instead of "Miss-ile" and "Cell phone" instead of "Mobile".

Two more examples I think should be added. Megabyte, from Reboot, see here and Aran Ryan. I'd add them myself but I'm honestly not sure exactly what kind of accents they are in the first place and don't want to look the fool.