In December 2016, Red Fly Studios showcased several Wii prototypes of various games the developer had conceptualized for the console. These games include: Batman Arkham Asylum, the original Devil May Cry, a re-imaging of Namco's Dig Dug, and Star Wars: X-Wing vs. TIE Fighter 2.

Two prototypes surfaced online in 2018 that may have allowed the Wii Remote and Nunchuk to function as a controller for the GameCube.

In 2017, Nintendo lost a patent lawsuit with Texas-based tech company iLife Technologies Inc. who claimed that the Wii, Wii Remote, and Wii U infringed on their patents. The suit filed by iLife back in 2013 claimed that Nintendo had infringed on their patents which include devices that "contain systems or methods for body movement detection, body movement evaluation, body movement analysis, receiving body movement signals, analyzing body movement signals, responding to body movement signals, and remotely monitoring body movement signals."
The court decided that Nintendo had breached one of their patents and was ordered to pay iLife $10.1 million, less than what they originally wanted which was $150 million. Nintendo is currently seeking to appeal the decision.

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!

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.

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.

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.

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.

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.

The blinking blue light that indicates a system message has been received is actually synced to the bird call of the Japanese bush warbler.

The Wii Nunchuk has a similar structure to the middle part of a Nintendo 64 controller.

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.

Nintendo's Wii Motion Control technology was presented to Microsoft and Sony and was rejected by both before being brought to Nintendo.

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.

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.