The Common Hatred

It is well known that in Super Mario 64, the mirror room in Peach's Castle is not an actual mirror (since the Nintendo 64 would be incapable of creating real-time reflections in this manner) and is instead merely a copy of the room behind a pane of glass.

The mirror side of the room contains Mirror Mario, who is a separately coded object from Mario and as such is subject to several discrepancies that make him perform different actions from the real Mario under specific circumstances.

The biggest discrepancy is what happens when Mario actually enters the Snowman's Land wall/painting. Since the real Mario unloads at that point, and Mirror Mario is programmed to copy whatever real Mario is doing (but cannot himself unload), he assumes a standard pose (what would be a T-pose in most games, but is an A-pose in this one) instead.

Super Mario Odyssey contains unused code for a "CeilingKeep" state for Mario that does not resemble anything found in the finished game, or in Mario games in general, which can only be described as "ceiling with ice floor puzzle mechanics".

A typical ice floor puzzle in a video game will take away the player's control upon stepping on a slippery surface and make characters keep moving in a straight line until they either leave the ice floor or hit an obstacle.

This state confers the same ability, bafflingly, to a ceiling instead. The ceiling would "grab hold" of Mario, make him move without player input in the direction he was facing when he touched it, and only let go when he reached the end of the ceiling.

What this could have been used for, and what such a ceiling could have looked like, is unknown.

Top: a diagram of the state. Bottom: an example of an ice puzzle, the Ice Path in the Generation II Pokémon series games.

Extremely rare 1995 Nintendo of America employee jacket with an embroidered Diddy Kong and Dixie Kong design.

In Super Mario Odyssey, one of the compliments Mario receives from Cappy after performing impressive feats is "Amazing! I'd take my hat off to you, but..."

This is referencing the fact that Cappy's species, the Bonneters, have two forms: a "ghost form" in which they appear as a small ghost with nub arms (similar to a Boo) wearing a hat, and a "hat form" in which they are only the hat itself. Since their eyes are on the hat in both forms, it is logical to assume that the hat is the main/essential part of their being and the ghost body is an auxiliary construct. As such, the possibility of them being able to remove the hat seems very unlikely.

However, if we assume that such a thing is possible, i.e. that a Bonneter can remove the hat while remaining embodied in just the ghost part, then Cappy's model is not actually fully modeled enough to see what that would look like. As the top of his ghost body is always covered by the hat, it is missing from the model.

Still, Cappy's sister Tiara does have a fully modeled ghost body underneath her veil. This allows us to view at least her in this hypothetical "hat off" form, and if Cappy were to have one, it would likely look very similar to this.

nature is healing

In the kiosk demo version of Mario Kart DS, some of the paintings on the Luigi's Mansion track actually moved, shaking and bulging out as though trying to escape in case of the Boo paintings, and simply shaking in case of the Chauncey paintings, as seen in the footage.

This was removed completely in the finished version of the game for an unknown reason.

However, the functionality was restored when the track was brought back for Mario Kart 7, though with the alteration that all paintings in that version are Boo paintings and as such all of them move, instead of only specific ones like in the Mario Kart DS demo.