In the Evergreen Terrace Rummage sale, Marge has an antique Olmec head, Xtapolapocetl, on sale which was gifted to Bart by Mr. Burns in this episode after Bart donated his blood to save Mr. Burns.
In the Evergreen Terrace Rummage sale, Marge has 'I didn't do it' shirts on sale which references this episode, where Bart becomes an overnight sensation as the "I didn't do it" boy and gets his own franchise and merchandise.
During their fight, former President Bush attempts to kill Homer by strangling him with piano wire that he pulls out of his watch. This is the villain, Red Grant's, signature weapon in the film.