* ActorAllusion:
** [[Creator/ScottMcNeil Zizrar, King of the Mole People]] who has a very similar voice to a certain iguana said at the end of Season 3, "[[WesternAnimation/KryptoTheSuperdog Man, I hate that kid and super dog!]]"
** [[Creator/JamesArnoldTaylor Johnny]] wants to be a [[Website/YouTube SnoobTube]] [[http://www.youtube.com/user/JamesArnoldTaylor sensation.]]
* AdoredByTheNetwork: Is constantly getting new episodes and reruns, despite having a ''huge'' {{Hatedom}}. Eventually the network [[OurProductSucks got sick of it as well]], but found they had no choice but to keep making it thanks to certain Canadian laws.
** It doesn't help that more well-liked shows were alledgedly replaced to make room for it.
** Christmas Day 2014 was "Johnny Test-Mas"---a marathon of Johnny Test including episodes that weren't aired before the show was cancelled. [[TrollingCreator Way to spread some holiday cheer, CN.]]
** It's just as bad in Canada, since Season 2 and beyond are produced for Cancon. However, Creator/{{Teletoon}} airs [[SeasonalRot Seasons 2 and 3]] over and over again, but enjoys the show as much as [[Creator/CartoonNetwork the American broadcaster]]. Season 1 has never aired. (Likely because Teletoon doesn't own the rights to the [[ScrewedByTheLawyers American-produced Season 1]]
* ChannelHop: From [=CW4Kids=] (formally Kids WB) to Cartoon Network, made official with the coming of a fourth season.
* LostEpisode: The first six episodes of the series with Johnny's original voice actor (who is still unnamed to this day) cannot be found anywhere.
* MoneyDearBoy: Supposedly, this was why the series lasted so long despite having a large {{Hatedom}}. Compared to other shows, ''Johnny Test'' was incredibly cheap to make, so much so that even with the bare minimum of people watching it, Creator/CartoonNetwork could ''still'' turn a profit on it. Considering it primarily aired when Cartoon Network was going through hard times, it's believed this fact was what caused it to become AdoredByTheNetwork despite its haters, simply because no matter ''what'' time-slot they put it in, they could always profit off of it, and use it to fill airspace when they couldn't afford to do so with other shows. In essence, ''Johnny Test'' was filling airtime while still turning profit was what allowed other, more budget expensive shows like ''WesternAnimation/AdventureTime'' and ''WesternAnimation/RegularShow'' to see the light of day and, notably, once the channel was able to handle itself once again, ''Johnny Test'' was canned not long afterwards.
* ScrewedByTheLawyers: One of the possible factors in the show's eventual cancellation. According to TV producer David Straiton, he and Scott Fellows created the concept for Johnny Test back in 1995, and unsuccessfully pitched it to a number of networks. Years later, he finds out that Scott Fellows got the show on TV and David Straiton got no credit and no money from it, which led to David Straiton suing Scott Fellows for fraud and accounting malfeasance.
* TheOtherDarrin:
** In Season Five, Louis Chirillo has been replaced with Creator/TrevorDevall. And it is very noticeable, with the entire voice pitch changed and Trevor struggling to keep the same inflections with obvious throat pain (going by the rough, scratchy noises). And for all his effort he just ends up sounding like Hugh Test.
** Mary Test was voiced by Brittney Wilson in Season One before [[Music/HeyOcean Ashleigh Ball]] took over. For whatever reason, Brittney returned for Season Five before Ashleigh resumed the role again for Season 6.
** The original pilot used to pitch the show used American voice actors (with Creator/JamesArnoldTaylor as Johnny Test) before switching to Canadian voice actors for the series proper. Despite this, James kept his role since the Canadian voice actor that replaced him didn't sound close enough to his voice, and so he redubbed the dialogue and kept his role for the rest of the series.
* WhatCouldHaveBeen: A full-length movie was actually considered at one point. The series is cancelled now, so it's very unlikely to get made.

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