Saw it Sunday. Smaug is indeed Smaug the Magnificent. Legolas is the bomb with a bow & arrow. However Peter Jackson REALLY changed a lot of the book and I didn't particularly like that.
Peter Jackson has a cameo at the beginning and Stephen Cobert has one in Laketown - guy adjusting his eyepatch.
And no need staying after the credits. No extras.
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"I’m not a psychopath. I’m a high-functioning sociopath. Do your research.†-Sherlock