Called the Cretaceous period the Cretaceous era (the terms aren't interchangeable [even though people do use those words interchangeable], and it was the wrong period to begin with).
Said that Thomas Edison invented electricity (electricity existed beforehand; Edison was one of many to do experiments with it).
Said that as a hamster, he is high in HDL (high-density lipoprotein) cholesterol, which is bad (shouldn't that be low-density lipoprotein [LDL] cholesterol?).
And explained that a person can never change because their personality is imprinted on their brain at birth (safe to say, it's not).
Though, that Jimmy was wrong on that last one was kind of the point of that episode.
In rather unrelated note, Carl keeps complaining "Ow! My scapula!" when he hurts his back while he should've said back/spine. Scapula is one of bones in human shoulder.
Saying that creating vaccine for a viral infection by extracting its mitochondrion. Virus has no mitochondrion since it's an organelle found in most eucaryotic cells. No "Jimmy said it was a germ" excuse since they clearly used an image of typical bacteriophage and it's not even a virus known to cause disease in human.
Designated Hero: Jimmy isn't an abrasive character, but he does cause many of the problems he has to fix. Cindy herself lampshades it.
"Funny Aneurysm" Moment: 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).
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.
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 Jerkass later on.
Sam. While he was already a Jerkass 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 Jerkass 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.
Miss Fowl to some due to her treatment to Sheen (at least beforePlanet Sheen)...
Self-Fanservice: There are too many artists to keep track of who obssess over drawing Cindy Vortex without her pants on. It probably helps that she was seen without them- yes, her underwear is in plain sight -for about half of the first episode.
Shipping: Yes, even in a show where most main characters are age 10 to 13.
Tear Jerker: The scene in "Brobot" where Jimmy tries to deactivate Brobot. When he explains to Brobot what he's doing, Brobot (who, for once, doesn't sound happy or excited at all) says, "But...but then we can't play anymore. And you're my...big brother." Jimmy starts feeling guilty, and sheds a single tear...which lands in Brobot's circuitry and seems to short him out, causing Jimmy to feel even more guilty. It turns out that Brobot's indestructible, and all the tear did was tickle him, but still.
During "Return of the Nanobots," Hugh ends up believing he's the last person on Earth due to everyone else being deleted by the nanobots. When he realizes that he's alone, Hugh laments the loss of Jimmy and his wife (whom he actually calls by her first name, Judy).
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?).
Uncanny Valley: While the CGI isn't too bad, a lot of the character designs are surprisingly creepy looking.
Vindicated by History: When it first aired, many slammed the show for being too similar toDexter's Laboratory, and the humor being So Okay, It's Average. However, since being off the air for several years now and a certain infamous fan animation reminding people of the series, people have since rediscovered it and given it a second chance, and got to see how the later seasons grew the beard in comparison to how it started. Nowadays, it's often hailed as one of the, if not the, last great Nicktoons on Nickelodeon.
Alternative Title(s):The Adventures Of Jimmy Neutron