These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Designated Hero: Ken, which is part of why the show is so hilarious. He basically goes around doing horrendous and needlessly cruel things and gets no reprimand or punishment. It's almost like he does stuff like that so often that no one is surprised by it anymore.
Ensemble Darkhorse: Hoshi and Dr. Volga are extremely popular among [MAD] makers, far more than the hero is. Both only appear in one episode.
Canon DefilementPlayed for Laughsnote (and therefore tolerated most of the time): Many fanworks make Ken a bigger bastard than he is in the actual series. Others make Hoshi go from having some Ho Yay with Ken to being a full-out Shotacon.
Fountain of Memes: The amount of videos uploaded to Nico Nico Douga and YouTube (although most if not all of the YT videos are re-uploads of the fansubs for accessibility) and fanart devoted to the series just keeps increasing. For the more traditional meaning of meme, many lines have mutated in Japan. Here are some examples:
How dare you sell such a lunacy record!" (よくもあんなキチガイレコードを!)
Ho Yay: Hoshi and Ken in the fourth episode. This becomes irrelevant when Hoshi is revealed to be a Jural.
So Bad, It's Good: The animation is godawful even by mid-70's standards. Recording quality is bathroom level; 95% of sound effects are missing (Ken's laser gun is often the only exception). The pacing is horrendous; episodes can and do switch from too-quick to sluggish on a dime. Finally, the "hero" is a certified jackass. This show is terrible. And it's glorious.