* ActingForTwo:
** Jyunichi Haruta was the on-set actor for Vul Eagle I for episodes 3 through 10, as well as Inazuma Ginga.
** Hideaki Kusaka portrayed both Sun Vulcan Robo as well as Führer Hell Saturn.
* TheDanza: All four Vulcans share their given names with the actors playing them (Ryūsuke Kawasaki, Takayuki Godai, Kin'ya Sugi and Asao Kobayashi).
* HostilityOnTheSet: The actresses for the four Zero Girls reportedly didn't get along very well, to the point where Creator/MachikoSoga (who played Hedrian) found them hard to deal with and requested Yukie Kagawa (who played Amazon Killer) to keep them in order.
* TheOtherDarrin: Zero Four of the Zero Girls is played by Toshiko Takashima during the first four episodes and then replaced by Kyoko Hiro for the remainder of the series.
* PropRecycling: The Jaguar Vulcan was reused by Popy/Bandai a few years later for their ''[[Toys/MachineRobo Machine Robo: Revenge of Cronos]]'' line, as a ship used by the villains, [[http://gbwiki.shoutwiki.com/wiki/Varigale-X Varigale-X]]. (The same line also reused the [[Series/ChoushinseiFlashman Titan Boy]] mold -- twice!)
* RealLifeRelative: Asatarō Hyō (Asao's father in Episode 38) is played by Asei Kobayashi, Asao Kobayashi's actual father.
* RealLifeWritesThePlot: Ryūsuke Ōwashi/[=VulEagle I=] was planned to have been written off the show from the start, as his actor Ryūsuke Kawasaki's singing career forced arrangements to have him leave the show early in order to focus on his new album release.
* WhatCouldHaveBeen: Despite various hints of a possible crossover between the Sun Vulcan and Denziman teams (including Queen Hedrian outright mentioning Denziman in an early episode), no such thing actually happens in the series. There was even a publicity still of both teams posing in costume that was published in magazines when the series was still airing.
** Before Haim Saban showed interest in Bioman, [[Creator/StanLee Stan "The Man" Lee]] wanted to bring Sun Vulcan over to Western audiences (Marvel held the copyright to this series despite not being involved with much). He even suggested adapting the series by using American actors for the out-of-suit scenes and stock footage for the transformed fights, just like ''Franchise/PowerRangers'' eventually would. One of the networks it was pitched to was '''Creator/{{HBO}}''' (which at the time didn't have much in the way of original programming). [[http://i.imgur.com/20fZfJA.jpg See]] [[http://i.imgur.com/FZiGUXU.jpg here]]. Incidentally, the CEO of Marvel Productions at the time, Margaret Loesch, worked with Stan Lee on the pitch. She would leave years later to join the then-fledging Fox Network to work on their children's programming lineup, where she would be in the position to accept Saban's pitch for ''Power Rangers'' and give it the backing it needed to get it on the air.
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