 The credits contain references to famous pieces of art, including Adam and  Eve by Lucas Cranach the Elder, The Arnolfini Portrait by Jan van Eyck,  American Gothic by Grant Wood, and Andy Warhols Campbells soup can. Also  alluded to are the lesser known Couple Arguing and Romantic Couple by  Robert Dale (drawn in a comic book style similar to that of Roy  Liechtenstein) and a 1940s "Am I Proud!" poster by Dick Williams (showing a  woman holding cans).