Below are the versions of Mario's and Luigi's signatures that are currently closest to being official. Mario's signature was shown in a trailer for Mario Tennis Aces. Luigi's signature was seen on an item in Paper Mario.

The Nintendo Switch version of Captain Toad: Treasure Tracker contains an unused model called "Stalker", which depicts a simplistic cube-shaped creature holding a knife. This was likely a test version of an enemy that was planned to be added to the Nintendo Switch port.

When Mario or Luigi get caught in a Tweester tornado in Super Mario Galaxy, they assume special models that simulate rapid arm rotation by using two extra arms. Here are the models extracted from the game's data.

In the data of Yoshi's Island, there are two alternate unused versions of Yoshi with a full mouth (left: used in game, middle and right: unused). It is unknown if these were simply early graphics or remnants of a mechanic where Yoshi could eat much larger objects than usual.

Two of the Super Mario Odyssey bosses are supposed to be grotesque mechanical versions of regular enemies. This is obvious with the Mechawiggler; however, Torkdrift's Japanese name indicates it is a mechanical version of a Spindrift enemy from Super Mario 64.

In Paper Mario: The Thousand-Year Door, the temporary follower characters are entirely interchangeable. When brought to an event, a wrong follower will simply act like the correct one without crashing the game. Here are the Yoshi Egg acting as Frankly and Punio acting as Flavio.

A pre-release screenshot of the Waluigi Stadium track in Mario Kart: Double Dash shows that in that version, the audience consisted of countless Marios, Luigis, Warios and Waluigis. This was removed in the finished game, likely due to these characters being supposedly unique.

The internal names used for the characters in the code of Mario Kart 64. Of particular interest is Luigi being called "Luizi"; this game is the only instance of him being referred to with this spelling.

In Super Mario 64 DS, getting crushed while holding a coin box while on low health will both kill the character and restore some health through the coins. This traps the character indefinitely in a state of simultaneously being dead and alive, requiring the game to be reset.

Near the lighthouse in Delfino Plaza in Super Mario Sunshine, there is an alcove blocked with goop that requires Yoshi to clear. Going into first-person view in the alcove reveals that due to a texture error, it is lined with many tiny doors and windows.

One official Mario Kart DS render features characters driving around a globe. For an unknown reason, Yoshi's model in this render has a much smaller nose than in other artwork for the game.

US patent 6115036A details "Mario Factory", a game-making game that later inspired WarioWare: DIY and Super Mario Maker. Many of the illustrations depict an original animal character with half-closed eyes. It is likely that, had the game released, this would have been its mascot.

Promotional photo of Nintendo of America founder and former president Minoru Arakawa playing the Game Boy on a chair with a Mario decoration.

In Super Mario 64, holding R in the "Lakitu/Stop" camera mode allows Mario to get arbitrarily far away from the camera. Doing it in a course with atmospheric fog, like Jolly Roger Bay or Tick Tock Clock, shows that Mario's model is not affected by fog and always remains visible.

In Super Mario Bros. 2, if a Subspace door is positioned over a patch of grass and the player character plucks it quickly after exiting Subspace, the plucked object will be worn on the character's head instead of carried. Details in image.

Goombella is the only character from the original pre-Sticker Star Paper Mario continuity to be referenced in both Paper Mario: Sticker Star (left, on a note in Level 5-1) and in Paper Mario: Color Splash (right, the Pry Guy enemy's book is identical to her Tattle Log).

During a visit to Frankfurt, Germany in 2004, a correspondent of the British NGC magazine has asked randomly chosen German citizens on the street to draw Mario and Yoshi; he mentions that to his surprise, most people knew the characters in question. Here are their drawings.

In a 2013 Year of Luigi interview, Shigeru Miyamoto has stated that he would be open to creating another brother for Mario and Luigi in the future.

In Super Mario Maker 2, if the Boss/Final Boss sound effects are placed on an enemy, the music will play automatically when it is on screen, which it does not with non-enemy objects. An exception is the snowball, which the game considers to be an enemy.

In Mario Party 7, Mario uses a larger than usual texture for his irises during the Ghost in the Hall minigame, presumably since he is scared (left: normal irises, right: during the minigame). Due to the split screen, this is hard to see without increasing the internal resolution.

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