* ActingForTwo: A variant. Toshimichi Takahashi voices Armored Captain Gatezone, but also physically portrays General Jark (who is voiced by Creator/SeizoKato).
* IronyAsSheIsCast: Would you believe ''Creator/KenjiOhba'' as a FantasyForbiddingFather in #33?
* RoleReprise: Creator/MasakiTerasoma reprises his role as the voice of Shadow Moon.
* WhatCouldHaveBeen:
** The series was initially planned out as a standalone Kamen Rider show with little to no connection to its [[Series/KamenRiderBlack predecessor]]. But due to the popularity of Kamen Rider Black, the execs at Toei decided to retool the show as a direct sequel at the last minute. This explains why most of the RX suit is green.
** Reportedly, there ''were'' plans for a follow-up to be made, but they were scrapped; Ryohei Kobayashi auditioned for a role, but because said series was canned, he was given the part of Fumiya in ''Series/ChikyuuSentaiFiveman'' to make up for it.
** The kaijin Death Garon was planned initially as an RX version of Shadow Moon, hence the design similarities.
* WorkingTitle: Before being retooled as a sequel to Black, the proposed title of this series was called ''Kamen Rider R2''.
* YouLookFamiliar:
** Makoto Akatsuka, who played Shunkichi Sahara (the dad), previously guest-starred in Episode 28 of the [[Series/KamenRiderBlack previous season]] as the nameless father of the kid of the week.
** Creator/YokoHonna as a child actress appears as Chigusa in episode 9, having previously appeared in episode 32 of the previous season as a completely different one-off child character, Yuki.
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