Awesome Music: The soundtrack of independent college rock has given otherwise-forgotten bands a cult following they rightly deserve. And let's not forget about Mark Mulcahy and his band (made exclusively for the series soundtrack), Polaris.
Ear Worm: Summerbaby by Polaris. It's so infectious that there's an entire episode devoted to Little Pete becoming obsessed with it.
Not to mention the memorable show theme, Hey Sandy.
Waiting for October, Coronado II, almost if not all the soundtrack of the series is definitely an Earworm.
Hilarious in Hindsight: Would you have guessed that Danny Tamberelli (Little Pete) would later start a band and sing by boot? His biggest motivation and inspiration was, indeed "Hard Day's Pete" (that happens to be his favorite episode because it completely changed his life) and when the prop master of the series also gave him his first bass guitar. Well, it's also the music influence the show had, that even regular-guest-star, Iggy Pop taught him how to play bass. And even when he got out of acting, his most major degree focus in College was something related to it.
Narm: Very, very rare, but there's at least one memorable incident—in "Yellow Fever", after Big Pete takes the blame for the actions of a put-upon classmate, Endless Mike (who's spent the episode attempting to corrupt Pete) shouts angrily, "You're out of my gang!" On the commentary, those involved spend the next two minutes laughing and go on to claim that Rick Gomez to this day shoehorns it into conversations.
Too Good to Last: While the shorts proved to have the enough success to lead to specials, and finally a TV Series in the process of 4 years... the show just had 3 seasons. The creators have aknowledged various times (from the DVD commentaries bits, the reunions, and even old interviews) that meanwhile it was critical acclaimed, it had poor ratings if you compare it with other shows of the time just like The Ren & Stimpy Show or The Secret World of Alex Mack. Then again, Nickelodeon screwed withthe schedules of the third season episodes (that took more than one year to finish airing), there was also some executive shuffling in the middle... it didn't quite mesh so much with the kids demography and it finally killed the show. However, noting that the protagonists were getting older (Michael Maronna was almost college age by the end of the series), and that the focus of the third season changed so abruptly to little Pete, maybe, it was for the best?
The Woobie - Yes, Stu is both a Chew Toy and a Woobie. You can laugh and still sympathize.