* BigLippedAlligatorMoment: Again, the Hitler Building.
* DesignatedHero: Space Chief helps save the kids from the aliens at the beginning, but does pretty much squat after that. He doesn't even get to finish the Neptunians off.
** Of course, as his secret identity he does beat them. In fact, his civilian version is a lot more useful in every respect.
** He more or less becomes "Too Little Too Late Chief" by the end. He shows up after a few dozen buildings have been blown up, probably hundreds dead, and even then, he takes his sweet time actually taking down the ships.
-->''(singing)'' "Space Chief failed miserably and tried to cover up his shame."
* DudeNotFunny: This supposed kids' movie uses footage of real WorldWarII boming runs, during which ''actual, living human beings were killed'', as cheap stock footage during its aerial battles. The uncut version even includes footage of an atomic bomb! The MysteryScienceTheater3000 crew in particular found this extremely appalling, which is why this film's riffing is much harsher than most other movies they took on.
** Apparently, what really put the MST3K crew over the edge was the infamous "Hitler Building," a building with a gigantic mural of AdolfHitler, which gets blown to bits during the movie's climactic battle.
*** GodwinsLaw?
* FashionVictimVillain: ''"Ha-ha-ha-ha-ha...Your costume is ridiculous!"''
* {{Narm}}: Space Chief's first appearance, the "Roji-Panty Complex", and the classic case of misplaced stock footage where the Neptunians blow up a giant mural of Hitler.
* TheScrappy: Given the lack of parents, and the omnipresence of the kids, they fit this trope as well.
* SerialNumbersFiledOff: [[PrinceOfSpace Alien invaders? Check. Mysterious superhero with the word "Space" in his name dedicated to fending off the invaders in his flying machine? Check. Roving gang of Japanese children? Check.]]
* SpecialEffectFailure: Space Chief's [[strike: bulletproof flying rocketship car]] cardboard-mockup-finmobile-on-a-first-generation-''keijidosha''-chassis and the Neptunians' "pirogies of death".
** Also, the use of WWII StockFootage becomes even ''more'' painfully obvious thanks to a building fašade being...[[AdolfHitler a bit out of style]], to say the least.
* WhatAnIdiot: A very average summer storm apparently presents enough of a threat to the electro-barrier that the good Doctor orders that the city's main defense be ''turned off.''
* WTHCostumingDepartment: One of the few areas where Space Chief actually has a leg up on Prince of Space is the fact that his outfit isn't quite as ridiculous - but it's still very silly looking. Ditto the Neptune Men; not nearly as goofy looking as the chicken men of Krankor, but they're pretty bad.
** When not in their clunky space gear, the Neptunians can be told apart from normal humans by wearing extremely heavy eye shadow and lipstick.
* UnfortunateImplications: The kids are a bunch of misogynists, and the movie salutes them for it.
** [[ValuesDissonance It was early 1960's Japan; a misogynistic double-whammy]].