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There are several references to Warner Bros. animated cartoons throughout the film. Mr. Smith (Clive Owen) is wise cracking and eats carrots like Bugs Bunny, whilst Hertz (Paul Giamatti) hunts him like a darker Elmer Fudd (note the similar facial structure). Also, Hertz’s cellphone plays Richard Wagner’s ‘Ride of the Valkyries’, which was parodied in the cartoon What’s Opera, Doc? (1957) as ‘Kill the Wabbit’.