* BileFascination: And even those strong souls will have to endure how bad it is, if [[Series/MysteryScienceTheater3000 Joel and the bots]] haven't.
* {{Padding}}: About half an hour's worth, as aimless shots of the military are used in long, silent stretches.
* SpecialEffectsFailure: The "space capsule". Douglas would have had to be short and pear-shaped and stood the whole way to barely fit into it.
* TheyJustDidntCare: [[HalfwayPlotSwitch Why does the movie suddenly switch over to a different set of characters midway?]] [[FauxlosophicNarration What's with the unnecessary pretentious narration?]] Why does the story screech to a halt at the end and lay down a [[GainaxEnding completely nonsensical resolution?]] Several reasons:
** ''Monster-a-Go-Go'' originally started as a monster movie called ''Terror at Half-Day'', directed by Bill Rebane. However, Rebane was forced to stop production when the film's budget ran out. ''Terror at Half-Day'' then remained unfinished for a few years until infamous splatter film director Herschell Gordon Lewis came along and bought the footage from Rebane.
** H.G. Lewis needed a film that could be sold as part of a double feature with one of his own films, [[MoneyDearBoy which was the more profitable move at the time.]] And so, he decided to "complete" Rebane's movie by directing several scenes that would later make up the second half of ''Monster-a-Go-Go'', adding the pretentious narration, and then hastily piecing it all together.
** The resulting film, despite being a terrible mess, was still released to the public. It has since then gained a legacy as being one of the worst movies ever made.