When Henry is eating the muffin, he takes a bite. Then a different muffin with more berries and no bite suddenly appears in his hand.
Jimmy's model of the solar system changes drastically between shots without anyone touching it. A fluffy blue ball disappears then reappears, while a rainbow-colored ball does the same. The arrangement of the duct tape also changes.
Sean and Eddie comment that this is the Ramones' Farewell Tour and they go to all their "farewell tour" shows. The Ramones actually retired permanently five years earlier, with their final tour in 1996.