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The actors take shape in ways they never have before, they're all at the top of their game. Jude Law really earned my full respect here. Jason Schwartzman was fantastic as well - very believable and easy to relate to. Now, I have always liked Mark Whalberg's acting, but this was the best I've ever seen him. There were some nice cameos as well, including one from Said Taghmaoui, the man who played Whalberg's interrogator in Three Kings, and a friend of Russell's.
Jon Brion's score, as his scores always do, perfectly compliments the film. I also loved Russell's color scheme. He decided to only include red during intense moments. This may seem like an obvious decision - "Come on, Tom, haven't you seen Run, Lola, Run?" but it is used with more subtlety than is the case with many other films. Also in Russell's arsenal is a clever usage of fine art and poetry. The paintings that flesh out the scenery, the use of Bob Dylan's work and even Dustin Hoffman's character's kinship with the painter Magritte are well utilized.