San Castellaneta is a reference to Homer's voice actor Dan Castellaneta.
Leona Carter calls the 2 cops Murtaugh and Riggs. The names of the 2 main characters in the Lethal Weapon films.
The music that plays during the Ralph/Chief Wiggum "elephant" scene is called "Baby Elephant Walk" by Henry Mancini.
Homer's joke when stuck to the park bench ("Take a seat." "Thank you, I have my own.") is similar to a joke from the classic film 'The Bishop's Wife.'