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* AwesomeDearBoy: Tao Okamoto agreed to sign on to star in the film after her agent told her that she would be starring opposite Creator/HughJackman as it turns out that she had a crush on him ever since seeing him in ''Film/XMen1'' when she was a teenager.
* CaliforniaDoubling: Parts of the film set in Japan and Canada were filmed in and around Sydney, Australia.
* DyeingForYourArt: Creator/HughJackman regained a ton of muscle after losing weight for ''Film/{{Les Miserables|2012}}'' and finally got to achieve the look he wanted when he played Wolverine in the first X-Men film. Because he would be shooting the fight with Shingen Yashida shirtless, Jackman stopped eating for a few days and even stopped drinking water in order to show maximum muscle definition and to make his veins pop out more.
* FakeNationality: Korean-American Will Yun Lee playing Japanese Harada. Wolverine himself, a Canadian played by Australian Hugh Jackman. Also [[spoiler:Magneto, a German Jew played by a Brit]]. Averted with all the other plot-important Japanese characters being played by actual Japanese people.
* FollowTheLeader: While the use of post-credits scenes was nothing new (not even in this franchise, as ''Film/XMenTheLastStand'' already did its own), the Franchise/MarvelCinematicUniverse popularized their use as a tool for 'world-building', i.e. using them to tie non-sequel movies into a bigger universe. ''The Wolverine'' "copies" this concept as it contains a stinger that ties it into ''Film/XMenDaysOfFuturePast'', when originally this movie wasn't going to be related to ''Film/XMenFirstClass'' nor the original trilogy.
* TheOtherDarrin:
** In the Mexican Spanish dub, Shingen was originally voiced by Creator/PacoMauri. In the dub of "Unleashed", Mauri was replaced by Creator/GabrielPingarron. Also, [[spoiler:Guillermo Coria takes over the role of Charles Xavier in this movie due to the passing of his previous voice actor, Federico Romano]].
** In the European French dub, [[spoiler:Magneto is voiced by Creator/PhilippeCatoire, replacing Creator/BernardDheran who voiced that character in the original trilogy and passed away in January 2013]].
* StarDerailingRole: While she's still a prolific actress in her native Russia, Creator/SvetlanaKhodchenkova's attempt to break into Hollywood came to a juddering halt with this film, and as of 2020 she's yet to appear in another English-language film.
* StarMakingRole: For Creator/TaoOkamoto who was later cast in ''Series/{{Hannibal}}'' and ''Film/BatmanVSupermanDawnOfJustice'' specifically from her performance in this film.
* TroubledProduction: This was one of the less troubled production in the series, with most of the difficulty coming from a protracted pre-production phase. Creator/DarrenAronofsky spent close to a year developing the film, but ultimately dropped out for much the same reason that Creator/MatthewVaughn had quit ''Film/XMenTheLastStand'', namely having to deal with being separated from his young family[[note]](In a sad footnote, his marriage to Creator/RachelWeisz broke down not long afterwards)[[/note]] and excessive amount of ExecutiveMeddling (plus the studio wanting a PG-13 movie, but Aronofsky wanting to do a hard-R movie). After a regime change, the project was rebooted under Creator/JamesMangold. After that, things generally went reasonably smoothly, the only major issues coming firstly when Mangold had to miss a few days of filming due to food poisoning and was replaced in the meantime by second unit director David Leitch, and then cinematographer Amir M. Mokri quitting for undisclosed reasons late in the shoot and then taking his name off the movie, resulting in second unit cameraman Ross Emery replacing Mokri and ending up as the solely credited cinematographer.
* UnderageCasting: Ichirō Yashida was a soldier during World War II, but Haruhiko 'Hal' Yamanouchi was ''born'' in 1946!
* WhatCouldHaveBeen:
** Creator/KatieLeung and Creator/JessicaHenwick were considered for the role of Yukio before Creator/RilaFukushima was cast. Henwick would eventually go on to portray [[ComicBook/DaughtersOfTheDragon Colleen Wing]] in the Franchise/MarvelCinematicUniverse.
** Creator/JessicaBiel was approached for the part of [[ComicBook/{{HYDRA}} Viper]] before the casting of Creator/SvetlanaKhodchenkova.
** Creator/DarrenAronofsky was originally set to direct the film before Creator/JamesMangold was hired. However, Aronofsky dropped out of the project due to the fact that the long overseas shoot would prevent him from seeing his family. Aronofsky was previously considered to helm ''Film/XMenTheLastStand'' before Creator/BrettRatner was hired.
*** Creator/GuillermoDelToro had discussions about directing the movie as well, [[JustForFun/OneOfUs as he was a fan of]] ''{{ComicBook/Wolverine|1982}}'', but turned it down as he didn't wish to spend over two to three years of his life working on the film.
*** Creator/JustinLin, Creator/DougLiman, [[Film/TheAccountant2016 Gavin O'Connor]], Creator/AntoineFuqua, [[Film/{{Static}} Mark Romanek]], [[Film/RoboCop2014 José Padilha]] and [[Film/DraculaUntold Gary Shore]] were also considered to direct the film before Mangold was hired.
** [[Film/TheFullMonty Simon Beaufoy]] was approached to write the script for the movie, but declined due to his reluctance to commit to the film's production schedule.
** This was originally positioned as a sequel to ''Film/XMenOriginsWolverine'' but thanks to both the poor reception to that film and the fact that there were so many things that just don't work with the continuity following it, it was tied back to the continuity as established by ''The Last Stand''.
** [[http://creativescreenwriting.com/wolverine-two-writers-one-character/ According to]] co-writer Mark Bomback, ComicBook/{{Rogue}} was going to appear, but was written out.
** Early drafts would have had Wolverine as the only mutant character.
** An alternate ending for the film, found on the DVD release, featured [[spoiler: Logan receiving the comic-accurate yellow and black costume Wolverine costume from Yukio, complete with the trademark mask.]]
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