* CrossDressingVoices: Averted, even though most of the boys are about 10 to 12.
** Yet Numbuh 5's voice actor is male in Japanese.
* TheDanza
** Cree Lincoln, voiced by Cree Summer, a rare non-live-action-sitcom use.
** Also somewhat worth mentioning is RachaelMacFarlane, who plays Numbuh 362 a.k.a. Rachel.
* DawsonCasting: Played straight. None of the actors voicing the kids are actual children.
* ExecutiveMeddling: A positive example: The 2x4 technology came about when Creator/CartoonNetwork wanted the high-tech gadgets changed since [[ItsBeenDone it was already done on]] ''WesternAnimation/DextersLaboratory''. Creator Tom Warburton later stated that it became his favorite thing about the show.
* FakeBrit: And other nationalities...
** Numbuh One: voiced by Ben Diskin, who, by the way, also voices Numbuh Two.
** Also, a Fake Aussie -- Numbuh Four, voiced by Dee Bradley Baker.
** [[FakeIrish Fake Scottish/Irish]] -- Numbuh 86, voiced by Jennifer Hale.
* HeyItsThatVoice: Try associating the voices from this show with other cartoons. Your head will surely ''EXPLODE''.
** [[Creator/BenDiskin Numbuh 1 and Numbuh 2]] are both [[KingdomHearts3DDreamDropDistance Young Xehanort]]. All of [[Tropers/MugenKagemaru this editor]]'s '''''WHY''''' when he found this out, and had his image of them ruined.
** Before becoming a ROOT ninja, [[Manga/{{Naruto}} Sai]] was bald and had a British accent.
** Kuki is voiced by LaurenTom, who plays Amy and her mom, Inez, on ''WesternAnimation/{{Futurama}}'', Tasumi on ''WesternAnimation/TheReplacements'', Connie (Kahn, Jr.) and her mom, Minh, on ''WesternAnimation/KingOfTheHill''. And in continuing with being vocally typecast as an East Asian[[note]]Chinese, Japanese, Korean, etc[[/note]] girl and her mother in cartoons, Tom plays both Kuki Sanban and her mother, Genki in this series.
*** Numbuh 3 is also [[WesternAnimation/TeenTitans Jinx]]. Mushi gets to play her in Jinx's last episode. In fact, one of the only young, popular characters she voices that ''doesn't'' fit into the AsianAirhead trope in some manner is Kahn "Connie" Souphanousinphone, Jr. from ''WesternAnimation/KingOfTheHill''.
** Numbuh Four is voiced by Dee Bradley Baker in one of the rare times that Baker isn't voicing an animal (Klaus the goldfish from ''WesternAnimation/AmericanDad''), doing announcer work on a game show (like ''Shop Til You Drop'' and ''Legends of the Hidden Temple''), or doing animal vocal effects. He's also voiced [[VideoGame/{{Halo}} the Gravemind.]]
*** As well as Ra's al Ghul from VideoGame/BatmanArkhamCity
** Numbuh 86 and the computer is [[VideoGame/KnightsOfTheOldRepublic Bastila]], [[VideoGame/MassEffect female Shepard]] ''and'' [[VideoGame/MetroidPrime Samus]]. This proves the Multiverse theory true.
** [[TheDanza Cree]] Lincoln is Penny in the 1980s ''WesternAnimation/InspectorGadget'' cartoon, Susie in ''WesternAnimation/{{Rugrats}}'', Elmyra Duff on ''TinyToonAdventures'' (and the reviled ''WesternAnimation/{{Animaniacs}}'' spin-off ''Pinky, Elmyra, and the Brain''), and Max in ''WesternAnimation/BatmanBeyond'', which is arguably even more of a mindscrew.
** She's also Dr. Young, from VideoGame/BatmanArkhamAsylum!
** In an extremely un-family friendly role, Cree was also the slutty, rascist Foxxy Brown
** Numbuh Five's father has a voice that is a caricature of BillCosby, with all of his speech patterns. The voice of Dr. Lincoln is Creator/KevinMichaelRichardson. Numbuh Five's voice actress, Creator/CreeSummer, is connected to BillCosby by the SpinOff show ''ADifferentWorld''.
** I'm surprised that Maurice [[WesternAnimation/TeenTitans didn't start using a sonic cannon.]]
** Not to mention that in "Operation: W.H.I.T.E.H.O.U.S.E.," [[spoiler:Numbuh One's future son]] is GregCipes, a.k.a. [[WesternAnimation/TeenTitans Beast Boy!]]
** Stickybeard is voiced by none other but MarkHamill (Luke Skywalker, The Joker on the 1990s ''Batman'' cartoon, [[WesternAnimation/TimeSquad the Larry 3000]], etc).
** Numbuh 362 is the sister of SethMacFarlane (''WesternAnimation/FamilyGuy'', ''WesternAnimation/TheClevelandShow'', ''WesternAnimation/AmericanDad'', ''Film/{{Ted}}'', the original ''Larry and Steve'' pilot)
** Numbuh 1's dad is Creator/FrankWelker, the first and current [[{{Transformers}} Megatron]].
** Lizzie is GreyDeLisle; you may recognize her as Tootie on ''TheFairlyOddparents'', Frankie from ''WesternAnimation/FostersHomeForImaginaryFriends'', Daphne from the ''WesternAnimation/ScoobyDoo'' movies and some of the series, Mandy from ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'', and Catwoman from VideoGame/BatmanArkhamCity, among others.
** Count Spankula is [[WesternAnimation/TheFairlyOddparents Cosmo]] and Gordon the janitor on ''Series/NedsDeclassifiedSchoolSurvivalGuide''.
** Hello? MauriceLaMarche as Father?
* KeepCirculatingTheTapes: It's been released on DVD a few times, a couple of random "Best of" DVD's, but never in box-sets or a complete season.
** The entire series is available on iTunes and the Playstation Network though, and the first 3 seasons have been put on Netflix.
* LoadsAndLoadsOfRoles: Once you start noticing the nuances, Creator/CreeSummer, Creator/DeeBradleyBaker, TomKenny, and JenniferHale are ''everywhere''.
* TalkingToHimself
** Happens more than often for Numbuh 4, as Creator/DeeBradleyBaker voices dozens of other extra roles, including villains (notably the Toilenator), operatives, and background characters.
** Numbuh One and Numbuh Two. Both are voiced by Ben Diskin.
** Cree Summer voices both Abigail and her sister [[TheDanza Cree]].
** The Delightful Children from Down the Lane's voice actors are three of the Sector V voice actors.
* WhatCouldHaveBeen
** Numbuh Three was originally only going to speak Japanese with an occasional English subtitle.
** Numbuh Five originally was supposed to be TheVoiceless (this was only fulfilled in "Operation: T.H.E.-F.L.Y.).
** "Operation: S.P.A.N.K.E.N.S.T.E.I.N." was originally a thirty-minute Thanksgiving special.
** Also, Lizzie's original character design was changed before her debut episode was made. Apparently her old appearance was too ugly for the execs.
** One episode, "Operation: T.R.E.E.S.", an episode-long ShoutOut to Creator/DrSeuss and specifically to ''The Lorax'', was [[IncrediblyLamePun axed]] early in its production, due to it running right on the heels of the movie of ''HortonHearsAWho''.
** The [[JokeCharacter Toiletnator]] was originally going to be a one-time character in Operation N.O.-P.O.W.U.H. only.
** Grandfather was originally going to have a wife shown!
* TheWikiRule: [[http://knd.wikia.com/wiki/Main_Page The KND Code Module.]]
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