Platform: Wii

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.

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.

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

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.

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

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 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.

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.

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.

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.

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.

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!

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.

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

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, Devil May Cry, a reimagining of Namco's Dig Dug, and Star Wars: X-Wing vs. TIE Fighter.

Retro Studios, according to one of it's developers Bryan Walker, were at first extremely concerned about wanting to develop for Nintendo's upcoming Wii system due to the console's mediocre specs compared to the competition. However, being among the first westerners to see a prototype of the unique controller for the console, they were immediately won over by the gaming machine's groundbreaking motion-control gimmick.

“...And we were a little concerned to be blunt, and then, ta-da: they rolled out the Wii Remote. Kind of in unison, the whole team went, ‘Ohhhhh. Ahhhh. Okay.’ Everybody was watching at E3 where the Wii was rolled out and the stampede when they opened the door of people running right past the Sony PS3 display to get in line with the Nintendo display to play the Wii. We were like, ‘Ah okay. We understand now. We’ll be quiet.”

In 2017, iLife originally won a court case against Nintendo stating that they infringed on their patents and Nintendo was ordered to pay iLife $10 million. However, in 2020 after Nintendo appealed the verdict, a federal court in Dallas overturned the verdict stating that iLife patent was invalid. Thus iLife's $10 million award from Nintendo was declared null and void.

The different musical themes of the Wii and its applications, such as the Mii Channel and Wii Shop Channel, were written by Nintendo's in-house Music Producer Kazumi Totaka, who is responsible for numerous game themes and scores to some of Nintendo's most celebrated IPs and who is also responsible for the reccurring "Totaka's Song" Easter Eggs hidden in the numerous games he's worked on.

Super Mario All-Stars Limited Edition has the smallest filesize of any Wii disc released to retail.

As of 2023, only 4 licensed IP adapted games have been released on Nintendo's retro game digital download services: Teenage Mutant Ninja Turtles for NES on Wii (which was later delisted on January 26, 2012), Transformers: Mystery of Convoy for NES on Wii, Quest for Camelot for Game Boy Color and GoldenEye 007 for N64, the latter two being on Switch.

Additionally, J.J. & Jeff, Punch-Out!! Featuring Mr. Dream, and Super Mario Bros. 2, all reskins of licensed titles, have been available in their license-less formats.