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Within the data for the Check Mii Out Channel, there are two textures of a human character. Strangely enough, the first of these textures is also found within the data for Club Penguin: Game Day!
Contributed by SonicManEXE
There are unused icons in the system's BIOS that suggest the Wii remote had the capability to act like a TV remote. This feature would later be implemented in the Japanese-only TV Friend Channel, and later on the Wii U's GamePad.
Contributed by xianc78
It's possible to use candles as a sensor bar. The light from the candles acts as the sensor bar's infrared lights, which are received by the controller.
Contributed by Tuli0hWut
Mii characters were originally planned to appear on the Famicom Disk System. However, other staff at ##Nintendo## didn't like the idea, so it was pushed to their list of possible future ideas. The idea was experimented with on the Nintendo 64 Disc System. It was initially believed that there was no way to use the Mii characters within games, and also that users who are not artistically proficient wouldn't be interested in the feature.
Contributed by Nintendude789
In September 2001, Nintendo quietly bought a minority stake in Tom Quinn's company 'Gyration'. They did this because he had a worldwide patent on gyrometer-based motion control technology, and had researched the field for a number of years. As part of the acquisition, Nintendo was granted licenses to use Quinn's motion control tech, as well as take advantage of his technological know-how.
Contributed by Tuli0hWut
The idea of having a speaker built into the Wii Remote came from game developer Yoot Saito (credited for the games Odama and Seaman) when he mentioned that the controller could ring like a phone or make noise along those lines. Many of the development teams thought they could make good use of it, and it was deemed worth the cost of including it in the Wii Remote.
Contributed by KidDivinegon
The blinking blue light that indicates a system message has been received is actually synced to the bird call of the Japanese bush warbler.
Contributed by KidDivinegon
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The Wii Nunchuk has a similar structure to the middle part of a Nintendo 64 controller.
Contributed by pkmngmr
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On the Photo Channel, the "Undo All" option when doodling makes the same "rocket ship" erase graphic and horn sound effect as an erase option in Mario Paint.
Contributed by GorgonBull35
Nintendo's Wii Motion Control technology was presented to Microsoft and Sony and was rejected by both before being brought to Nintendo.
Contributed by pkmngmr
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While downloading content on the Nintendo Wii Shop, there is a slight chance that you'll encounter Luigi on the download page, and not Mario.
Contributed by pkmngmr
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In the console's BIOS, there is a unused disk graphic which represents a DVD Video. It's possible that there were plans for support of DVD Videos.
Contributed by Ghost