* DuelingGames: With ''VideoGame/SonicTheHedgehog4''. To a lesser extent, with ''VideoGame/DonkeyKongCountryReturns'' as well.
%%* DummiedOut: [[http://www.mariowiki.com/List_of_New_Super_Mario_Bros._Wii_beta_elements Quite a few things, actually.]]
* GodNeverSaidThat: Despite claims to the contrary, there's no indication that the blue and yellow Toads are named "Bucken-Berry" and "Ala-Gold," respectively. The only statement on the matter comes from an unverified claim by ''Destructoid'' writer Jonathan Holmes about an undocumented encounter at Nintendo New York. The fact that "Ala-Gold" is derived from "Allah Gold," the name for Anakin Skywalker in ''WebVideo/BackstrokeOfTheWest'', further disproves the veracity of the statement. Nintendo of Japan never stated anything of the sort either.
* KillerApp: Announced and released at a time when sales of the UsefulNotes/{{Wii}} were starting to lag, ''New Super Mario Bros. Wii'' became a ''massive'' hit at over 30 million copies, boosting sales of the Wii hardware for the 2009 holiday season and being one of the top 20 best-selling video games of all time.
* NoExportForYou:
** Was re-released on the UsefulNotes/WiiU [=eShop=] in Europe, Australia, and Japan, but for some reason never in America.
** A slightly UpdatedRerelease of the game was released on December 5, 2017 for the Nvidia Shield TV, featuring high definition 1080p graphics and a slightly redesigned UI, but [[https://www.gamespot.com/articles/nintendo-wii-and-gamecube-games-are-being-remaster/1100-6455380/ only in China]].
* RefittedForSequel:
** The game's co-op multiplayer, which allows players to pick up and throw one another, was originally created for a prototype to a ''VideoGame/SuperMarioBros1'' sequel-- later reformatted as ''VideoGame/DokiDokiPanic'', then as an '''actual''' ''VideoGame/SuperMarioBros2''. The multiplayer was excluded in the finalized versions of both games, meaning that it took roughly 22 years for Nintendo's co-op ''Mario'' multiplayer mechanic to finally see use.
** King Bills were first conceptualized as far back as ''VideoGame/SuperMarioWorld''; development files unearthed from the 2020 Gigaleak included graphics for a behemothic Bullet Bill that takes up the entire screen. The idea would eventually be resurrected and implemented in this game.
* ShortRunInPeru: The game came out in Australia before any other region, unusual for a Mario platformer.
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