- Acting for Two: 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.
- Actor Allusion: The scene with Jiro and Otoya in the hospital, with Jiro begrudgingly assisting 'patient' Otoya, is actually a parody of Zanki's first appearance in Kamen Rider Hibiki, 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, Shuki.
- Speaking of which, Kenji Matsuda's been in a wolf-themed outfit before. Not Zanki, Touki.
- Also we have Otoya dancing to Zenryaku Michi no Ueyori, after his actor Kouhei Takeda performed a cover version as part of the boy band PureBoys (which also provided Nago's actor).
- And Yuria Haga in the role of Mio takes a fatal Rider Kick from one Rider to defend another one, just like she did in Kamen Rider Faiz. Interestingly, the roles of the Riders are inverted in each season.
- Crosses into Take That! 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, but he gets finished off by IXA eventually. It's worth noting here that Yuri's henshin pose seems to be modeled on that of the Gransazers' Flame Tribe.
- The Movie has physical cameos by the voice actors of the Taros; to make sure you notice, each of them delivers their character's Catchphrase. If you missed it, Masaki Terasoma (Kintaros) is the teacher, Koji Yusa (Urataros) is the chess player, Kenichi Suzumura (Ryutaros) is the soccer goalie and Toshihiko Seki (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? Freeza.
- The Danza: Keisuke Kato as Keisuke Nago.
- Dawson Casting: Averted. Kamen Rider Faiz may have been 5 years earlier, but Yuria Haga was born in 1987, which realistically places Mio's birth after the events of '86.
- Jossed: Megumi's father is MIA, though some assumed it to be Jiro, which eventually became false as he's shown being sealed as an Arms Monster well after she leaves him.
- Name's the Same: There was another Shima back in Kamen Rider Blade, also a mentor-type role who turns out to be one of the monsters of the year.
- Talking to Himself: 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 Tomokazu Sugita, and the two Kivats were reunited near the end of the series. However, while Norio Wakamoto voiced both Arc Kivat and Rey Kivat in The Movie, the two never interacted with each other.
- Real Life Writes the Plot: 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 Emperor Form suit for most of the series.
Trivia / Kamen Rider Kiva