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It is well known that in Paper Mario: The Thousand-Year Door, there is a Toad that references Fire Emblem. However, in the Japanese version of the game, Luigi's adventures have two more Fire Emblem references that were removed in other languages.

Source: IkeRadiantHero

Original illustration used for a 1986 officially licensed Super Mario Bros. jigsaw puzzle from Japan.

Source: blacktangent

Super Mario All-Stars contains a debug mode for Super Mario Bros. 3 in its code, which can be activated either deliberately by setting a single address in memory to a specific value (e.g. via a cheating device) or, curiously, by complete accident simply upon starting the console (as explained in my video here).

Two of the functionalities of the debug mode is the ability to swap between power-ups at the press of a button, and the ability to enter "free movement" mode whereby Mario slides freely around the screen in all directions instead of needing to walk.

If the free movement mode is activated while Mario is in specific animations, and then the power-up is changed during it, his sprite may become jumbled. While normally, the sprite simply changes to other parts of Mario's sprite sheet, a particularly amusing change occurs when swimming as Frog Mario and then swapping to Fire Mario while in free movement. This will make Mario assume a big "25" graphic alongside bits and pieces of his body.

Source: IgorOliveira66X

Players of Super Mario Advance may recall that one of the major changes in that game compared to the Super Mario All-Stars version of Super Mario Bros. 2 (on which it is mostly based) is the inclusion of two new boss intros for Fryguy and Clawgrip, respectively.

In both cases, the action stops and a cutscene shows four bubbles (identical to Wart's bubble attack) float up from the bottom of the screen and surround an entity before transforming it into the boss (a mask for Fryguy and a small Sidestepper crab for Clawgrip).

The game actually contains two unused scenes for the same intro happening with two more bosses: Mouser and Tryclyde, shown restored in the footage. Mouser is created from a unique small mouse sprite, while Tryclyde is created from a Cobrat.

This implies that during the game's development the idea of Wart's magic being responsible for most of the game's bosses was more prevalent, before these scenes were scrapped for an unknown reason.

Source: AkiraTheGamer

OP: "Decarbonized formaldehyde is great. Just wash daikons with decarbonized formaldehyde and they turn white."

"Decarbonized formaldehyde" (脫碳甲醛) is an online phrase used to make fun of people that blindly avoid chemicals. Formaldehyde (H2CO) decarbonized is water (H2O).