* DawsonCasting: While the other actors were close to their characters' ages (some of them were even younger), Touta Tarumi was 28 when he played Jin (who is supposed to be 23).
* HeyItsThatGuy: Ley Nefel is played by Sayoko Hagiwara, alias [[Series/KagakuSentaiDynaman Dyna Pink]]. This phenomenon looks... contagious, as later on, Kihachirou Uemura, who played Dai/Green Flash, would go on to play a villain in ''Series/ChikyuuSentaiFiveman''.
** [[HeyItsThatGuy Hey It's That Guy's]] [[HeyItsThatVoice Voice]]: Sir Cowler is played by Creator/JojiNakata, aka [[HellSing Alucard]], [[Manga/{{Naruto}} Baki]], [[SgtFrog Giroro]], among others. He also went on to play the [[BigBad lead villain]] in ''Series/ChoujuuSentaiLiveman'', Great Professor Bias.
** La Deus is voiced by Creator/UnshoIshizuka AKA [[MobileSuitGundam00 Sergei Smirnov]] and [[Anime/CowboyBebop Jet Black]].
** Kihachiro Uemura/Green Flash, who would later voice Chaka (one of Vivi's aides in Alabasta) in ''Manga/OnePiece''.
** Ley Wanda was the first major villain role played by Yutaka Hirose, who would go on to play other villains in later ''Sentai'' shows ([[Series/ChoujuuSentaiLiveman Dr. Kemp]], [[Series/ChoujinSentaiJetman Tranza]], and [[Series/GoseiSentaiDairanger Jin Matoba]]).
** Kazuoki Takahashi (Sho Hayate in ''Series/DengekiSentaiChangeman'') plays Miran, a young man who believes that Sara is his missing sister in Episode 21.
** Ryosuke Kaizu, who would go on to play Takeru/Red Mask in the following ''Sentai'' series ''Series/HikariSentaiMaskman'', guest-stars in Episode 27 as aspiring boxer Ryu Wakakusa.
** Mina Asami, [[ActingForTwo who would go on to play a double role]] in ''Series/HikariSentaiMaskman'' as Prince Igam and Princess Iyal, guest-stars in Episode 40 as Cybele, a renegade Mess researcher who helps out Jin.
** Koji Unoki, who was Yosuke Shima/Dyna Blue in ''Series/KagakuSentaiDynaman'', appears in Episode 5 as Officer Hiroshi Tachibana, a policeman who befriends Lou and Sara.
** Yoshinori Okamoto, who in this series played Cowler's assistant Bo Gardan, was in ''Series/DengekiSentaiChangeman'' (the previous series as Booba). He also returns in ''Series/ChoujuuSentaiLiveman'' (along with the actors of Cowler and Wanda) as Doctor Ashura.
* WhatCouldHaveBeen: Titan the Hero was originally planned to be a semi-regular character who would show up once in a while to help out the Flashman team and pilot the Great Titan. Had this been the case, ''Flashman'' would've been the first Sentai series to feature an [[SixthRanger extra hero]].