 In the episode "The Old Man and the Key" the closing credits are a parody  of the ending of _"Beverly Hillbillies, The" (1962)_ (qv), with the Simpsons  standing in front of a doorway waving at the audience, while banjo music  plays. When the Gracie Films logo appears, Lisa is heard saying, in a  hillbilly accent, "This has been a Gracie Films Presentation, yall".