Mario Kart 7
Mario Kart 7
A portion of the Bowser's Castle theme is remixed from Mario Kart: Double Dash!!'s Bowser's Castle theme.
Contributed by MeleeWaluigi
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Inside the game's files is an unused soccer ball. It's likely this could've been used for testing the models, or it could've been used for one of the Wuhu Island stages.
Contributed by GamerBen145
The retro courses from Mario Kart DS have been widened in this game while retro courses from the other games have all been shortened.
Contributed by Stryker94
Each of the Retro Cups feature one course each from both Mario Kart DS and Mario Kart Wii.
Contributed by Stryker94
The Music that plays during Neo Bowser City (Koopa City in the PAL Regions) consists of music from other Mario Kart Tracks. These include:

• Toad/Mario Circuit from Mario Kart 7.
• The Title Screen from Mario Kart 7.
• Toad's Turnpike from Mario Kart 64.
• Luigi/Mario Circuit from Mario Kart Wii.
Contributed by CuriousUserX90
The results theme is a remixed version of the theme from Mario Kart 64.
Contributed by GamerBen144
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On the Piranha Plant Pipeway track, the clouds are recolored bushes. This is a nod to the original Super Mario Bros. where the bushes and clouds are the same art with different palettes.
Contributed by KidDivinegon
The game's initial lineup of playable characters, prior to unlocking more, are the original 8 playable characters from Super Mario Kart on the SNES.
Contributed by CuriousUserX90
In the European version of the game the track called "Music Park" in the American and Japanese version is called "Melody Motorway". Despite the name change, the American/Japanese name "Music Park" can still be seen on banners in the level in the European version.
Contributed by Mawille
On the track "Roselina's Ice World", the Comet Observatory and the starting planet from the Gateway Galaxy from Super Mario Galaxy can be seen in the background.
Contributed by Outofmind23
On March 15th 2012, Nintendo released a patch that stopped a glitch which let you skip a large portion of Wuhu Loop. This patch only covers the Online Multiplayer and not the Time Trials.
Contributed by Outofmind23
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Activating the Lucky 7 item underwater causes the blooper to leave a trail of ink bubbles.
Contributed by Outofmind23
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In Shy Guy Bazaar, the carpets have sprites of Angry Suns, Phantos, Pansers and Cobrats from Super Mario 2 and 3 on them.
Contributed by Outofmind23