Homer enter 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 , Frasier Crane remain silent despite being played by Simpsons veteran Kelsey Grammer , the voice of Sideshow Bob . Marge 's dream see her in the role of Mrs. Robinson from Lost in Space , while Homer play Dr. Smith . The scene where Marge and Jacqueline Bouvier duck down when a biplane shoot at them in a cornfield is a parody of Alfred Hitchcock 's film North by Northwest .