* ActingForTwo - Shoma Yamamoto played Takato Shiramine/Kamen Rider Rey in the ''Kiva'' movie, yet he appears in the television series as Taiga Nobori/Kamen Rider Saga, who has no connection to Takato/Rey.
** Though given that "rey" is Spanish for "king" it makes for a bit of subtle foreshadowing.
** But in this case, it was derived from a Japanese word for "cold"
*** Not to mention [[spoiler:Kohei Takeda playing both Wataru's father Otoya, and his KidFromTheFuture Masao in the GrandFinale]].
* ActorAllusion: [[CrowningMomentOfFunny The scene with Jiro and Otoya in the hospital]], with [[http://www.youtube.com/watch?v=i2Lce2n2F8o Jiro begrudgingly assisting 'patient' Otoya]], is actually a parody of Zanki's first appearance in Series/KamenRiderHibiki, where he assists a hospitalised Asumu a little more willingly. Earlier in ep. 9, Jiro's massive aversion to Yuri's horrible violin playing is an interesting parallel to Zanki being nearly killed by another string-based Oni, [[spoiler:Shuki]].
** Speaking of which, Kenji Matsuda's been in a wolf-themed outfit before. Not Zanki, [[TheMovie Touki]].
** Also we have Otoya dancing to ''[[http://www.youtube.com/watch?v=ZsF0afU6CPU Zenryaku Michi no Ueyori]]'', after his actor Takeda Kouhei performed [[http://www.youtube.com/watch?v=MNkXk8AnUks a cover version as part of the boy band PureBoys]] (which also provided Nago's actor).
** And Yuria Haga in the role of Mio [[spoiler:takes a fatal Rider Kick from one Rider to defend another one, just like she did in Series/KamenRiderFaiz. Interestingly, the roles of the Riders are inverted in each season.]]
** Crosses into TakeThat with Rook, as the IXA system's ''henshin'' requires depressing the IXA Knuckle just like the Sazer Knuckles of ''Gransazer''. Not only was Rook's actor previously Sazer Tawlon, [[spoiler:but he gets finished off by IXA eventually.]] It's worth noting here that Yuri's henshin pose seems to be modelled on that of the Gransazers' Flame Tribe.
** TheMovie has physical cameos by the voice actors of [[Series/KamenRiderDenO the Taros]]; to make sure you notice, each of them delivers their character's CatchPhrase. [[spoiler:If you missed it, Creator/MasakiTerasoma (Kintaros) is the teacher, Creator/KojiYusa (Urataros) is the chess player, Creator/KenichiSuzumura (Ryutaros) is the soccer goalie and Creator/ToshihikoSeki (Momotaros) is Officer Sanjou in 1986]].
** The Ladybug Fangire in #19-20 is designed with a skull-dome head. The voice actor's best known role? [[Manga/DragonBall Freeza.]]
* TheDanza: Keisuke Kato as Keisuke Nago.
* DawsonCasting: ''Averted''. Series/KamenRiderFaiz may have been 5 years earlier, but Yuria Haga was born in 1987, [[FridgeBrilliance which realistically places Mio's birth after the events of '86.]]
* {{Jossed}}: Megumi's father is MIA, though some assumed it to be [[spoiler:Jiro, which eventually became false as he's shown being sealed as an Arms Monster well after she leaves him]].
* NamesTheSame: There was another Shima back in ''Series/KamenRiderBlade'', also a mentor-type role [[spoiler:who turns out to be one of the monsters of the year.]]
** Series/KamenRiderRyuki had an escaped convict Rider named Takeshi. Kiva had another escaped convict Rider in TheMovie named Takashi. Close enough.
** Does Shima's [[Creator/BlueSkyStudios BlueSky]] group make CGI animated kids' movies for revenue?
* TalkingToHimself: Kiva has both played this straight and subverted it: In the main series, Kivat-Bat III and his father, Kivat-Bat II, are both voiced by Creator/TomokazuSugita, and the two Kivats were reunited near the end of the series. However, while Creator/NorioWakamoto voiced both Arc Kivat and Rey Kivat in TheMovie, the two never interacted with each other.
* RealLifeWritesThePlot: The reason Kiva's four base forms were essentially abandoned in the latter half of the series was because the suits were too heavy for suit actor Seiji Takaiwa. Thus, Kiva had to rely on the lighter [[SuperMode Emperor Form]] suit for most of the series.