In Mario Kart 8/Deluxe, the anti-gravity section on the GBA Mario Circuit track is held up by giant blue car jacks that have extremely faint writing on them. Enhancing the contrast shows it reads "Ultra Arm".

The name and design of the jacks is a reference to Ultra Hand, a toy produced by Nintendo in 1966 (designed by Gunpei Yokoi, later inventor of the Game & Watch and Game Boy among other achievements). The Ultra Hand has been referenced many times all across Nintendo media, recently famously through the "Ultrahand" ability in The Legend of Zelda: Tears of the Kingdom.

In addition to featuring the Ultra Hand in many WarioWare microgames, the man getting his wallet stolen on the packaging is also featured in the "Clawing for More" boss microgame in WarioWare Gold.

Newly discovered prerelease footage of Super Mario 64 shows that underwater chests used to have an extremely large activation radius earlier in development, being able to be opened by swimming past them rather than touching them, which would have even worked from behind.

In the finished version, the hitbox Mario needs to touch to open a treasure chest is much smaller and near the front of it so in practice he has to swim all the way to its lock and physically touch it. While the hitboxes in the final game may be difficult to activate due to their precision, it is likely the ones in the early version simply offered very little challenge and were changed for that reason.

Lucky bear!!! 🐻