Is it a commercial thing? They got Black Eyed Peas and some other band playing. Plus, they refer to two Lady Gaga songs! These songs are no more than two years old, and all have recently become not so popular.
Coincidence, actually something, or am I a moron?
Family guy makes an obvious anti-commercial joke in the end of their halloween episode! Fox properbly figured, if Macfarlene started copying the popular Simpsons halloween tradition and added a few commercials and some pop culture, they'd make some money while getting more viewers.