 The episode features a parody of the Michael Jackson song " Thriller " , as well as the music video . When Chef becomes a zombie , he is dressed like Jackson from the " Thriller " video , and he and the other zombies dance in a similar way . Chef also shouts " Oh " the same way Jackson often did during music performances . The song Chef sings is extremely similar to the actual " Thriller " song , but Parker said they deliberately made it " ( just ) different enough that we can 't get sued " . Stan is ridiculed for his likeness to Raggedy Andy , based on the rag doll character by children 's writer Johnny Gruelle ; Stan 's girlfriend Wendy was originally supposed to dress as Raggedy Ann with Stan , but she instead chose to dress as Chewbacca . When Cartman later dons a " ghost " costume , it resembles a costume from the Ku Klux Klan , the militant white supremacy organization . Parker and Stone said they feel Klan jokes are particularly funny because the concept of KKK is so stupid . Stone said , " Dressing up like ghosts to scare black people is just stupid . Stupidly funny . " The zombie @-@ version of Kenny is said to resemble Edward James Olmos , the American actor who played Lt. Martin Costillo in Miami Vice . 
