* BaseBreakingCharacter: Lisa in season three. Some fans don't mind her change of appearance, while others didn't like how her personality changed from an {{Adorkable}} geeky girl to a DudeMagnet.
* BigLippedAlligatorMoment: The "alternate ending" to the series finale. It consists of an alien invader appearing out of nowhere and the cast attacking him. You may see it [[http://www.teennick.com/videos/clip/alternate-ending-clip.html here]].
* BizarroEpisode: The Halloween special from the third season.
* CriticalResearchFailure: When Ned attempts to pass off Literature/GreenEggsAndHam as the book he'll use for his book report, he states that the person who doesn't like Green Eggs and Ham is Sam when in actuality, Sam was the one who liked them and was trying to get the unnamed character to eat them.
* DesignatedHero:
** Moze in some episodes.
** Cookie as well, '''especially''' around Season 3, where he began to take interest in Lisa Zemo ''after'' she had stopped having her crush on him and changed her appearance. His tendencies to [[LargeHam overreact]] to a lot of things as well as screwing up a lot (especially causing [[spoiler: Ned to fail his exam in Study Hall]]) didn't help the cause either, reaching TookALevelInDumbass red flags.
* EnsembleDarkhorse:
** Coconut Head. Full stop.
** Gordy also qualifies, as he was elevated from a recurring role in the first season to a starring role in the second and third seasons.
* FamilyUnfriendlyAesop: The ''Class Clown'' episode. While it is true that being amusing can lighten the tension in a School Environment, the episode encourages the viewer to clown around, even if it results in you getting in trouble.
* FunnyAneurysmMoment: The Halloween episode where Principal Pal is presumed dead after going into the Haunted House. Pal's actor, John Bliss, died a year after the show ended.
* HilariousInHindsight: iTeacher appeared a year before Series/{{iCarly}} ever existed.
* HoYay:
** Between Ned and Cookie.
** Also between Loomer and Cookie.
-->'''Loomer''': Together, Cook, we will rule the dodgeball court!
** Plus Cookie's whole subplot in Guide to: Girls, when Loomer fell in love with Cookie when he was dressed in drag.
-->'''Loomer''': (''grabs "Simone's" hand'') You're special, and I'd like to get to know the ''real'' you.
-->'''Cookie''': (''nervously'') No, you don't!
* HollywoodHomely: Lisa. [[UnnecessaryMakeover Until the third season, that is (aside from the "Spring Fever" episode.)]]
* LesYay: Between Moze and Suzie.
* RetroactiveRecognition:
** Christian Serratos (aka Suzie Crabgrass) later appeared in the ''Film/{{Twilight}}'' movies and is currently Rosita Espinosa on AMC's ''[[Series/TheWalkingDead The Walking Dead]]''.
** Daniel Curtis Lee (aka Cookie) would later play Kojo on Creator/DisneyXD's ''Series/ZekeAndLuther''.
** One of the Killer Bees was a pre-''Series/BigTimeRush'' Carlos Pena.
** Amy Cassidy, Jock Goldman's ex-girlfriend, was played by Creator/LucyHale. Hale went on to ''Series/PrettyLittleLiars'', which Lindsey Shaw would appear on several times.
** The Creator/AndyWarhol-esque art teacher in "Recycling" and "Art Class" was played by future voice acting icon Creator/NolanNorth.
** Creator/CameronMonaghan, now of ''Series/{{Shameless}}'' and ''Series/{{Gotham}}'' fame, played Palmer Noid in three episodes.
* SomeAnvilsNeedToBeDropped:
** While some of the tips are obviously meant to be PlayedForLaughs, and there are a few that [[FamilyUnfriendlyAesop obviously aren't "family friendly,"]] many of them ''are'' actually meant to be helpful and they can be if followed correctly.
** Teachers are human beings, who just want their students to succeed.
* SpecialEffectFailure:
** The show frequently uses puppets and unconvincing PeopleInRubberSuits to portray various animals, and sometimes rather obvious dummies representing characters doing painful stunts. It seems that this is largely done on purpose, considering the cartoony nature of the show to begin with.
** In the Pep Rallies episode, Cookie jumps onto a powerful trampoline and is launched through the gym's roof and lands outside the school. This was done using a computer model. However, immediately after Cookie crash landed outside of school the model flipped into an upright position.
** This is actually invoked in one episode where Moze thought she'd knocked out two of Coconut Head's teeth. The "teeth" are obviously pieces of white breath mints that have been cut to resemble teeth. Since audiences were used to the terrible effects, the audience just assumed it was his teeth. Then it was revealed that it really was breath mints in-universe as well.
** At the end of the "Guide to: Notebooks", Sweeney is hanging from a harness in his classroom. Gordy and Ned are in the room with him. Gordy swipes a caramel apple out of Sweeney's hand, and proceeds to spin him around like a tornado. As the screen goes to an IrisOut transition to go to commercial, you can look through the editing effect of Sweeney rapidly spinning around, ''and see Don Creech, the actor who played Sweeney, completing his first rotation, flailing his arms and legs, and screaming in a panic''.
* SuspiciouslySimilarSong:
** The first chords of the tune that plays when Ned is explaining his tips to the audience sound a lot like the main riff of "I Can't Explain" by Music/TheWho.
** Crubbs' theme is a knockoff of the ''Series/MiamiVice'' theme.
** The disco song that plays during the "School Car Wash" episode is inspired by Rose Royce's "Car Wash".
** The theme that plays during the Talentpalooza is inspired by Music/VanHalen's "Jump".
** The song that plays as Moze tries on new hair styles is very much like Music/{{Santana}}'s "Smooth".
** Christine the Bad Saw's riff is similar to the famous "Bad to the Bone" riff.
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