* AscendedFanon: Baby Rosalina was created by fans after the release of ''Wii'' (due to her and Waluigi being the only humans without a baby counterpart) before she was officially introduced for ''8''.
* CashCowFranchise: Got even bigger with ''VideoGame/MarioKartDS'' and ''Wii'', the latter actually selling better than ''VideoGame/GrandTheftAutoIV'', which would have been unthinkable the previous generation. And ''VideoGame/MarioKart8'' managed to be the-best second selling game the weekend of it's release (selling 1.2 million units) behind ''VideoGame/WatchDogs''. For comparison, ''Watch Dogs'' is a MultiPlatform game available to all consoles, while ''Mario Kart 8'' is exclusive to the worst selling console of [[TheEighthGenerationOfConsoleVideoGames the current generation]] and it itself managed to increase sales of just the WiiU by ''[[NumberOfTheBeast 666%]]'', with 82% of all copies being in bundles, making it very much the Wii U's first proper KillerApp.
* FanNickname:
** The infamous Spiny Shell is known to all its fans and haters alike as the Blue Shell. That, or a long string of profanity.
** The most common name for the Spiny Shell in Sweden is ''Ledarskalet'' translating into "the leader shell", [[ExactlyWhatItSaysOnTheTin because it targets the leading racer.]]
** The Thunder Cloud from ''Mario Kart Wii'' is also known as the "Herpes Cloud". Because you give it to other players by contact.
** ''Mario Kart Wii'' gets called ''Mario Bike Wii'' or ''Funky Bike Wii'' or ''Daisy Bike Wii'' due to rampant use of bikes or speed-boosting characters.
** ''Mario Kart 8'' sometimes gets called ''Mario Kart Zero'', due to the anti-gravity being like that of ''VideoGame/FZero''.
** Some people were also calling it [[VideoGame/SonicRiders Mario Riders Zero Gravity]] when it was revealed, due to the gravity gimmicks, though they're hardly the same.
** ''Bowser Kart 8'' because of the seven Koopalings and Bowser, exactly making 8 high-ranking members of the Koopa Troop.
** Metal Mario is sometimes called "silver Mario", mainly by those who view him as just a re-skinned Mario.
** The Rainbow Road from Mario Kart 8 has been nicknamed by GeorgeTakei as the "Gay Space Station".
* IKnewIt:
** Many had predicted N64 Rainbow Road would return for ''Mario Kart 8''. Same with Yoshi Valley and GCN Sherbet Land.
** Several had guessed Baby Rosalina would make her debut here. Pink Gold Peach, however, really came out of the blue.
* KillerApp: ''Wii'', ''7'', and ''8'' were this for the Wii, 3DS, and Wii U respectively (see CashCowFranchise).
* MemeAcknowledgment: Nintendo's Digital Event video during {{E3}} 2014 had a clip of Luigi giving his memetic death stare while pulling out a green Koopa shell when Reggie Fils-Amie mentioned ''Mario Kart 8'' at one point.
* TheOtherDarrin:
** In ''Mario Kart 7'', instead of Mercedes Rose reprising her role, Rosalina is instead voiced by Kerri Kane. No explanation is given for this change. In ''8'', she is voiced by Laura Faye Smith, her actress from ''VideoGame/SuperMario3DWorld''.
** Ludwig von Koopa was previously voiced by Mike Vaughn like Iggy Koopa, but is now voiced by David J. Goldfarb in ''8''. The change is ''very'' noticable.
* WhatCouldHaveBeen:
** Vanilla Lake had different music in the [[http://www.youtube.com/watch?v=lK-PG98e2t4 beta]] version of ''Super Mario Kart''.
** ''Mario Kart 64'' was called ''Super Mario Kart R'' during early development, and featured a Magikoopa as a playable character instead of Donkey Kong. The feather from ''Super Mario Kart'' was also planned to be in the game, but was removed for unknown reasons.
** The Golden Mushroom and fake item box were supposed to be in ''Super Circuit''. Their unfinished forms can be accessed by hacking. The game was also called ''[[SuperTitle64Advance Mario Kart Advance]]'', but that name only stuck for the Japanese release.
** ''Mario Kart DS'' initially had Professor E. Gadd as a playable character, with the Poltergust 4000 being one of his signature karts. Later in development, his spot on the roster was given to Dry Bones, and the Poltergust 4000 became one of Luigi's karts.
** During early development, ''Mario Kart Wii'' was called ''Mario Kart X''. However, the name was changed because ''VideoGame/SuperSmashBros Brawl'' is known as ''Smash Bros. X'' in Japan.
** Waluigi was meant to be playable in ''Mario Kart 7'', but got cut due to time restraints.
** ''Mario Kart 8'' originally had drills installed to the karts and bikes, so the player could tunnel through the ground. However, this idea was scrapped, because the dev team thought anti-gravity would be more interesting.