There exists a bug in live view where in the starting player spectated, the black outline goes fully around the player head. However, once changing perspectives, the black outline get distorted. It only appears on the right side of a player.
https://t.co/IMXDbDhPan
Bowser's Castle is based off the Music of Maple Treeway. While unnoticeable at first glance, if you speed up Bowser's Castle's Music you can definitely hear Maple Treeway.
You can hear a comparison in this video: https://t.co/PbVtnNNXfg
Just like Red Shells and Green Shells, it is possible for a Blue Shell to break on a banana. Although it is incredibly tricky to pull off. The video below shows an example.
There exists plenty of unused characters in the game files. One however, is Hammer Bro. This would have been the first Mario Kart in the series where Hammer Bro would have made an appearance, but he was scrapped. It would then take 10 years for him to be added to Mario Kart Tour.
Textures exist in Mario Kart Wii for Lap 4-9. Meaning that custom lap counts like in Mario Kart Double Dash was planned, but scrapped. Then, MrBean made a code that restored these lap counts. Long after that, Malleo discovered it was possible to get Lap 4 to trigger in vanilla.
There exists unused code in Mario Kart Wii that allows you to drag Blue Shells behind you. This code was removed in the final release, but was made into a Cheat Code by MrBean35000vr after the game's release.
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Mario Kart Wii was released worldwide in the first half of 2008, but in South Korea it was released in 2009. It was also meant to release in China around that time as well because there are unused China Safety Strap screens in the files in the South Korea version.