* ActorAllusion: Kenji Matsuda gets a lot of this for his role as Wataru Shijima/BARON the Thunder Knight in Makai Senki. He's in a mentor position and uses [[ShockAndAwe lightning]], like [[Series/KamenRiderHibiki Zanki]], and his armor is colored blue and wields a sword, like [[Series/KamenRiderKiva Kiva]] does when equipped with Garuru.
* TheDanza: Rei Suzumura is portrayed by Ray (pronounced the same) Fujita.
* DoingItForTheArt: The franchise makes some money from pachinko, but for the most part it's funded almost entirely out of pocket by Amemiya himself. ''Garo'' is his baby and he wants to keep it going. It helps that he was born into an extreme amount of wealth and earned a fortune himself in his career as a director.
* ProductionPosse: Gonza's actor was previously in a leading role in ''Series/TekkoukiMikazuki'', also produced by Creator/KeitaAmemiya.
* NoStuntDouble: The series is well known for being one of the few Tokusatsu productions to have its entire cast never use stunt doubles on a consistent basis.
* SpiritualSuccessor: to Anime/{{KARAS}}, to the point where the Kanji in the title is similarly stylized to that Karas's. Its been rumored that Karas was one of the original influences on the series.
* WhatCouldHaveBeen: Garo actually started as another attempt to revive ''Theatre/GoldenBat'' using a more modern design and would have been called ''Skull Z''.
* YouLookFamiliar:
** The theme park manager from Episode 10 of the 2005 series (who harasses Kaoru) would later go on to play Ratess in ''Makai Senki.''
** Kakashi, from ''Soukoku no Maryu'', was portrayed by Yuki Kubota, who previously played the obnoxious idol/actor JURAN in episode 9 of ''Makai Senki''. He was the episode's VictimOfTheWeek.
** Kouhei Otomo, who was Igari Juzo in ''Makai Senki'', returned in ''Series/GaroTheOneWhoShinesInTheDarkness'' as Burai.
** [[invoked]]Takano Hassei, the son of the old couple in ''Makai Senki'' #6 eventually became TheQuisling to the Horror Ring in ''ZERO: Black Blood''.
** Thane Camus, who plays Ring himself in ''ZERO: Black Blood'', had re-appeared as another Horror in Episode 5 of ''Makai no Hana.''
** Keiko Matsuzaka, who played BigBad Judam in ''Soukoku no Maryu'', reappears as Anna (Gonza's chef [[WillTheyOrWontThey girlfriend-of-sorts]]) in Ep. 10 of ''Makai no Hana.''
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