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.
That'd be quite a feat, since he only performed the music for the film, not the series!
Fanon Discontinuity: Many Matsumoto fans wish they had never made Maetel Legend due to the fact that it definitively shows Yayoi herself becoming evil and transforming into Queen Promethium of Galaxy Express 999-shades of Anakin Skywalker in Revenge of the Sith. Yes, there is a Palpatine type character that's responsible for this meaning that she is clearly manipulated into doing so. Previously, it was believed in fanon that Yayoi was instead the daughter of Promethium and that Yayoi would eventually become Maetel in 999.. Many prefer the 1982 Queen Millenia as the definitive resolution Yayoi sacrifices herself. End of story
Idiot Plot: Several plot threads only work out because every faction forgets critical information they already have or ignore the obvious whenever it's most convenient for the plot.