Fake Nationality: Korean Will Yun Lee playing Japanese Kenuichio Harada. Wolverine himself, a Canadian played by Australian Hugh Jackman. Also Magneto, a German Jew played by a Brit. Averted with all the other plot-important Japanese characters being played by actual Japanese people.
Adam Ross, a sculptor at Legacy Effects, created a prop for The Wolverine that revealed a yellow and black costume, complete with Wolverine's trademark mask. It went unused, though it's possible it would have been used for when a repowered Magneto and a revived Xavier recruited Logan during the movie's epilogue.