 The episode features several references to The Beatles and McCartney 's solo career . For instance , McCartney tells Lisa that playing his 1970 song " Maybe I 'm Amazed " backwards will reveal " a recipe for a really rippin ' lentil soup " . A modified version of the song plays in the final scene , then over the closing credits of the episode ; when played backwards , McCartney can be heard reciting the recipe in the song . Mirkin had McCartney record the recipe , which was later added in reverse over the original song . McCartney thought it was " very funny " that the staff wanted to " send up the whole cult thing " of backmasking on the Beatles ' songs . " A secret lentil soup recipe seemed a nice parody of that , " he said . One of the backwards snippets says , " Oh , and by the way , I 'm alive , " a reference to the " Paul is dead " urban legend . 
