Homer has an epiphany that other people's feelings, especially his family's, are just as important as his own. He acts selflessly for the first time, well, ever.
Positive Role Models & Representations
Besides the many painful gags involving Homer, a couple minor characters die (two are smushed); a robot commits suicide; mobsters haul a dead body in a rug; an angry mob tries to lynch the Simpsons; and Homer, as always, strangles Bart.
Bart skateboards naked -- his butt showing and a momentary penis shot. Homer and Marge get into bed mostly undressed to make love (no nudity is shown).
For the most part, same as any episode: "ass," "hell," "dammit," "cojones," "crap," "god--m," "screw"
Just well known fictional Springfield brands like Buzz cola, Duff beer, the Kwik-E-Mart, Krusty burgers, etc. Green Day and their song "American Idiot" are spotlighted.
Ease of Play
Bart drinks an entire mini bottle of whiskey; Otto smokes a bong; Homer and his bar mates drink beer at Moe's (and other places as well).