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This is a scene that did not show on the web version of the video. It’s another that comes straight from the books, as Tyrion and Jon travel north to the Wall. Dinklage’s accent here is interesting, but beyond me to place—any U.K. dialect experts? Obviously, he’s American, so there will doubtless be ... infelicities, but I’m sure some particular sort of accent is at least intended.
Notably, I spot two Lannister guardsmen in back, which is quite interesting, as in the book Tyrion travels only with two servants (though one, Jyck, is something of a bodyguard).