The Wii Nunchuk has a similar structure to the middle part of a Nintendo 64 controller.
Contributed by GorgonBull35
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.
Contributed by Ghost
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.