* TheOtherDarrin: Jason, Michelle, and the Penguins got new voice actors when the series got renewed for T.V. due to the original actors not being available and Jason's and Michelle's voice actors were grown up.
** Grandmum got a new voice actress three times.
* DawsonCasting: Averted, since Jason's and Michelle's voice actors were around their age.
* HeyItsThatVoice:
** Jason is [[Film/TrickRTreat Sam]].
** Zidgel is [[Anime/MobileSuitGundam Ramba Ral]], [[WesternAnimation/{{Exosquad}} Alec [=DeLeon=] and Sean Napier]], and [[WesternAnimation/SpiderManUnlimited John Jameson]].
** Midgel is [[Manga/InuYasha Naraku]], [[WesternAnimation/FantasticFourWorldsGreatestHeroes Dr. Doom]], and [[Anime/MobileSuitGundamSeed Rau Le Creuset]].
** [[Creator/LeeTockar Fidgel]] is [[JohnnyTest Bling Bling Boy]], and WesternAnimation/YakkityYak.
** Kevin is [[Manga/RanmaOneHalf Ryoga]], [[WesternAnimation/ReBoot Phong and Mike the TV]], [[WesternAnimation/XMenEvolution Sabretooth]], [[WesternAnimation/{{Exosquad}} Wolf Bronski]], [[WesternAnimation/TomAndJerryTales Spike and Droopy]], and [[WesternAnimation/SpiderManUnlimited Carnage]].
** Sol and Cavitus are both voiced by [[WesternAnimation/BeastWars Optimus Primal]] and [[AdventuresOfSonicTheHedgehog Grounder]].
** Admiral Strap is [[Manga/BlackLagoon Chief Watsup]] and [[XMenEvolution Principal Edward Kelly]]
** The Lizard King is [[Series/TreasureAttic Bunny Bighop]].
* IWantYouToMeetAnOldFriendOfMine: As noted above, for the TV series, Zidgel and Kevin had previously been [[WesternAnimation/{{Exosquad}} E-Frame pilots]].
* NowWhichOneWasThatVoice: Type 3, the only supporting character who has their voice credited is Admiral Strap.
* PlayingAgainstType: Paul Dobson, who usually voices a cunning evil villain or a thuggish strong guy, voices Midgel in the T.V. version, who is neither of these things.
** Lee Tockar is notable for playing either super obnoxious or below average intelligence characters. Here, he plays super-smart, anxiety-ridden Fidgel.
* WhatCouldHaveBeen: [[WordOfGod According to Tim Hodge]], an arc in the series where the Penguins crew have to chase Cavitus because he has the Metric Magnetic Matter Disperser was originally going to be added. In it, Fidgel needs to fix the galeezel so Jason and Michelle can return back to normal size at the end of the series. However, this was changed because they still wanted Grandmum in the series. Though they kept the idea of getting the galeezel back in the first and last episodes of the series.
* WorkingTitle: ''3-2-1 Penguins!'' was originally going to be ''Jason and the Penguinauts''.
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