 The scene with Grampa and Bea eating their pills seductively is a reference to the 1963 film Tom Jones . Two of the people waiting in line to ask for Grampa 's money are Darth Vader and the Joker . When the family is suggesting places they could go , Homer suggests the Springfield Mystery Spot , a reference to the Mystery Spot in California — although Lisa says that the Springfield Spot is simply a puddle of mud . They eventually decide to go the Discount Lion Safari , however . The Diz @-@ Nee @-@ Land amusement park that Grampa visits with Bea 's money has a sign that reads " Diz @-@ Nee @-@ Land — Not affiliated with Disneyland , Walt Disney World , or anything else from the Walt Disney Company " . The shot of Grampa sitting at a diner resembles the 1942 American painting Nighthawks . Before Grampa attempts to bet all of his money on Roulette he quotes the poem " If — " by Rudyard Kipling . The climax scenes , where Grampa uses the money to fix up the Springfield Retirement Castle , is a reference to the ending of the 1932 film If I Had a Million . Dr. Marvin Monroe 's ' Monroe Box ' is meant to be a spoof of B. F. Skinner 's Skinner Box . 
