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.
Badass Decay: Poor, poor Gigan. He's completely stripped of his ability to fly and use his buzzsaw, and is easily shafted in a Curb-Stomp Battle.
And Godzilla is reduced to being the Team Pet. However, according to Word of God (Jun Fukuda, director of many Godzilla movies and many eps of this series), this Godzilla is not the one in the films.
And yet Toho, who is more Word of God, says that the show is canon with the Showa films and that Gigan doesn't show up in any more films because he died in the show. Fans are still disputing whether or not to count the show as canon.
Jun Fukuda is not so much Wordof God in this instance, as a hired gun.
Big Lipped Alligator Moment: Being a kids show made in Japan there are a lot, but if one takes the cake it's Zone Fighter jumping into a TV and then appearing over the city the TV was showing being attacked by a monster.
Crowning Music of Awesome: The theme song is catchy as and the music for the second fight with King Ghidorah is also pretty good.
Ensemble Darkhorse: Just like Varan, Zone Fighter is mostly obscure even to fans but thanks to the internet some fans are shouting for DVD's of the show to be sold out of Japan and some fans are even asking to get Zone Fighter in a game.
Ho Yay: Zone Fighter and Godzilla's friendship could be a mild variation of this.