The five-disc DVD set of Game of Thrones' second season provides an exceptional amount of supplemental material on the show's production, primarily through 12 commentary tracks, including multiple tracks on single episodes. Among the participants are the main cast, including Dinklage, Headey, and Coster-Waldau, as well as series cocreators David Benioff and D.B. Weiss; director Neil Marshall (The Descent), who helmed "Blackwater"; and Martin himself, who explains many of the differences between his source novel and the program. The Battle of Blackwater Bay gets its own half-hour making-of featurette, while a quintet of the actors, including Headey and Clarke, participate in an informative roundtable discussion about their characters and the show's locations. Martin also returns for a brief conversation about the various religions of his fictional world along with Benioff and Weiss.
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