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Trivia: Kamen Rider Double
  • Actor Allusion: Aya Sugimoto, best known as Queen Beryl, appears in The Movie Double Forever: A to Z as a Maria S Cranberry.
    • Shotaro threw an epic one in "J's Labyrinth" when he wants to enter a models-only recreation club - Renn Kiriyama is, in reality, an actor/model.
      Guard: Members only, please. This club is for models only.
      Shotaro: Haha, that's sweet. I'm a model. So, ciao.note 
    • Also in Double Forever, Elizabeth manages to recover the T2 Accel, Key, and Bird Memories, a nod to the fact that her and Queen's actresses are members of the girl group AKB48.
    • Episode 45's first two minutes are devoted to reminding us of Yuka Hirata's previous role by letting her perform her extreme tsun-tsun, extreme dere-dere schtick.
    • Yoshie Gotou, one of the Stage Moms in "The O Chain", actually appeared in Kamen Rider Kiva as the woman who went into sports archery after her own Stage Mom pushed her to learn the violin. Karma's the real bitch here.
    • At one point, Jinno notes that Takeshi would be a nice name. Also, his use of Gratuitous English mirrors his schtick as a Fake American. And the name "Catherine" pops up later... note 
    • Masayuki Deai (Trigger Dopant), though not for one of his own characters. In W Returns: Eternal, he gives the classic BoukenRed "Good job !" and thumbs up.
    • In Begins Night (W's half of Movie Wars 2010) there's this hefty Museum Mook (Giant Mook?) who jumps and attempts a Rider Punch on Soukichi. He's played by Jiro Okamoto, suit actor for Kamen Rider Black.
  • Actor Existence Failure: Minoru Tanaka committed suicide after the film was released.
  • Dawson Casting: Mitsuru Matsuoka was 40 when he played Katsumi, who appears to be in his early to mid-20s based off the information given. Possibly justified since storywise he was growing up using an artificial chemical.
  • Defictionalization: Queen and Elizabeth are played by two members of idol group AKB48, and when they released their joint single "Love♡Wars", the Liar Dopant arc had them appear on an American Idol-esque contest (Fuuuuuutic Idol) performing the song in order to win a major label release.
  • Executive Meddling: Averted; the show's staff said that there was incredible pressure from Toei to make Double's primary color red (which is viewed as a heroic color in Japan, and is the reason the Law of Chromatic Superiority applies not only to several previous Kamen Riders but to Super Sentai as well). They apparently had to fight long and hard to avoid this, and only managed to get black and green as Double's default form by citing Riders 1 and 2 as their inspiration.
  • Fake Nationality: Kazu is played by Korean actor Gong Teyu.
  • Fan Nickname: Shirihiko note  and Nassca, for his butt scenes.
  • Hey, It's That Guy!:
    • Double is packed with Super Sentai alumni:
      • Lunagel from Mahou Sentai Magiranger (Meibi Yamanouchi) is Marina in "The W Search".
      • Kirihiko's little sister Yukie/Yuko in "Y's Tragedy" is Kaoru Hirata, who played Yuka Yamazaki, also in Mahou Sentai Magiranger.
      • The human form of Arms Dopant? That's AbaRed (Kouichirou Nishi). As if to push the point further, he states repeatedly that he loves to "rampage"note . And on top of that, Shotaro and Philip fight him with what is basically the Double equivalent of Abarekiller, spines and all.
      • "Jasmine Aya (Ayumi Kinoshita) wa ESPer Deka de aru."
      • And HurricaneBlue (Nao Nagasawa) appears in "The D was Seen" as Lily Shirogane, a stage magician who uses a Dopant Memory to cheat at her disappearing act. She would return in the Accel edition of Kamen Rider Double Returns as a waitress at her grandfather's coffee shop. She is still a magician, though, and even manages to allow Shotaro and Philip to escape police custody via her Memory-free vanishing act so they can assist Accel.
      • We have Naoki Kawano and Yuka Hirata from Juken Sentai Gekiranger appearing as Toru Kawai and Kyoko Todoroki in episodes 39 and 45 respectively. They previously appeared as the Big Bad Long and Dark Action Girl Mele.
      • BoukenSilver (Masayuki Deai) played the Trigger Dopant in Double Forever.
      • Rin Takanashi (Mako Shiraishi/Shinken Pink) and Sho Tomita (Yukito Sanjou/Abare Blue) appear in the Kamen Rider Eternal edition of Kamen Rider Double Returns alongside Jyunichi Haruta (Goggle Black & Dyna Black).
      • While not a Sentai alumni at the time, GokaiPink appears in episode 49.
    • Some Kamen Rider alumni, too:
      • Amane Kurihara from Kamen Rider Blade (Hikari Kajiwara) shows up in "The Vengeful V" as one of the art students.
      • The actor playing the human form of the Liar Dopant was in Kamen Rider Kabuto, playing a surgeon that rotated his duties with two Worms mimicking him.
      • Kirihiko showed up way back in the first two episode of Den-O as one of the bullies who harassed Ryotaro.
    • Of all the Japanese comedians who get bit parts in this show, the human form of Cockroach Dopant is a member of the comedy group Rahmens, best known for his role as "Persocom" from the Japanese Mac and PC commercials.
    • The teacher from "Find the C" which accosts the Dance Battler Dango could very well help Double with his crime-solving exploits as he is, after all, a retired Metal Hero.
    • One of Those Two Girls from Madan Senki Ryukendo (either Ichiko or Ritsuko) appears in episode 9.
    • The human form of the Sweets Dopant was in the J-Dramedy Shomuni: Power Office Girls.
    • Watcherman, the "Otaku blogger with a Funny Afro". There is a funny thing about that, it's not the first time that he has been an Otaku. The Funny Afro was the dead giveaway.
      • And with him is the human actor to the Money Dopant, the worldly travelling one asking for the details in the live-drama... that's Money.
      • Watcherman's actor, Nasubi, is also well-known for being one of the first Reality Television stars ever.
    • Aniki!
    • Tomoyuki Dan plays Dr. Isaka on-screen, meaning Chronicle Asher is the Weatherman!
    • Himeka from the "The Nightmarish H" and Nagisa from the "Beyond R" are both alumni from the Mahou Sensei Negima! live action series.
    • Also appearing in Double Forever is Aya Sugimoto (see Actor Allusion above).
      • Speaking of PGSM, Miyuu Sawai, a.k.a. Sailor Moon herself, made an appearance in Begins Night as a pop idol who had died a year before, and whose supposed ghost has been appearing to her sister.
    • "Mr O'Shaughnessy" cameos in W Returns: Accel as a Posthumous Character in flashbacks.
  • Hey, It's That Voice!: Fumihiko Tachiki is both The Narrator and the voiceover of the Gaia Memories, and by extension, the Double Driver.
  • Name's the Same: There's a Nasca in the third Keroro Gunsou movie. She's also an alterego (real name Miruru), with the ability to sprout wings.
  • Promoted Fanboy: Renn Kiriyama was a fan of Kamen Rider Black as a child.
  • What Could Have Been: "The O Chain" storyline has Shroud mention CycloneAccel Xtreme, and we even get an Imagine Spot-style image of it, but it doesn't happen and probably never will because it would involve breaking up Shotaro and Philip's partnership as well as fighting with hatred rather than compassion, two things Ryu refuses to do.
    • Though we did get CAX in Kamen Rider Climax Heroes OOO.
  • Word of God: The series itself is confirmed by the staff to be a homage to the Showa Era, from the little things such as the scarf to the overall feel of the series.

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