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In the flashback in Purgatory, Benny whistles "[http://en.wikipedia.org/wiki/In_the_Hall_of_the_Mountain_King "In The the Hall Of The of the Mountain King]" from the Peer Gynt , Suite No. 1, Op. 46.] by Edvard Grieg. :''(whistled by Benny in Purgatory)'' According to director [[Guy Bee]], this was an homage to the Fritz Lang Movie "[http://en.wikipedia.org/wiki/M_%281931_film%29 M]", where the killer played by Peter Lorre whistles the same tune.
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