 Homer enters the Cheers bar in a scene which is a parody of a typical episode of the comedy series Cheers . All of the speaking characters are voiced by the actors who played them in Cheers . Ironically , <unk> Crane remains silent despite being played by Simpsons veteran <unk> Grammer , the voice of Sideshow Bob . Marge 's dream sees her in the role of Mrs. Robinson from Lost in Space , while Homer plays Dr. Smith . The scene where Marge and Jacqueline <unk> duck down when a biplane shoots at them in a <unk> is a parody of Alfred Hitchcock 's film North by Northwest . 
