These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Adventures of Jimmy Neutron: Boy Genius
Adaptation Displacement: While The Movie was very popular, and still pops up on Nick every now and again, people often forget about it or think that it came after the show.
Growing the Beard: More of like Braiding the Hair; episodes after "Beach Party Mummy" tend to stand out more, shedding the spin-off-of-the-movie feel. In that particular episode Libby has decided to keep her hair braided, making her stand out more as well.
"Funny Aneurysm" Moment/Hilarious in Hindsight: In Retroville 9 Jimmy creates high-tech baseball gloves and automatic homerun hitting bats neutronized with the skills of three baseball players for his struggling baseball team. They effectively cheat their way to the little-league finals in Japan. The players Jimmy used were Barry Bonds (an alleged cheater), Mark McGwire (a confessed cheater) and Babe Ruth (dead).
The Scrappy: Carl Weezer. Primarily because he came off really, really annoying with his Squicky interests in Judy Neutron and his constant complaints about his scapula. It didn't help his character Took A Level In Jerk Ass later on.
Sam. While he was already a Jerk Ass when the show started, The N Men showed his asshole status when he sends the kids (minus Jimmy) to Area 52 due to their carelessness. While Jerk Ass Has A Point stands here, his behavior isn't necessary. It comes even more to an annoyance when Sheen came to him for help in order to get a main component to make Carl burp against Hulk-Jimmy (It Makes Sense in Context), but Sam rudely says no, all while calling Sheen a 'freak', prompting Sheen to just take it and have Sam complain that he owes him a $1.80 for it. And even after thanking him at the end of Jimmy's speech, he's still complaining about the $1.80.
Shipping: Yes, even in a show where most main characters are age 10 to 13.
They Wasted a Perfectly Good Plot: For Jimmy/Timmy Power Hour 3, which was originally was supposed to be a Grand Finale for bothshows. Who didn't want to see a 3D Dimmsdale and a 2D Retroville, Crocker spazzing out in 3D or the alien Mark Chang in 3D? And better yet, send the Gigglepies to Retroville and the Twonkies to Dimmsdale (we wonder if Timmy has learned from the Gigglepie experience?).