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In page The Bart Wants What It Wants:

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When first meeting Greta, Milhouse greets her by saying Whassup?. The scene is a reference to an advertisement campaign for the American Budweiser beer, in which several characters are seen calling each other and saying "Whassup?". In Moe's bar, Wolfcastle receives several questions from bar customers, prompting him to send in his "authorized look-alike" to give answers. In the DVD commentary for the episode, Jean stated that the scene was written at a time when celebrity look-alikes were making "excellent livings".[1] At one point in the episode, Bart and Greta are seen playing Scrabble, a word game manufactured by Hasbro.[2] The music cue that plays before and after Skinner's comedy routine is based on the intro music from the American television sitcom Seinfeld.[1]