1651
The Toad-like early designs for Princess Toadstool (right) and her otherwise unseen parents (left), previously known to appear only in the "How To Win At Super Mario Bros." guide (top row), have been discovered to also appear in another, even earlier Japanese guide (bottom row).
1652
In the Library on the Comet Observatory in Super Mario Galaxy, there are framed pictures above the fireplace that are too far from the camera to view clearly (top). Zooming in reveals that one of them is a stylized painting of Rosalina with a Luma (texture in the bottom right).
1653
The final story mission of Super Mario Odyssey contains a segment that is navigated by capturing a Pokio bird and sticking its beak into moving platforms. If another platform intercepts the Pokio, its body will be dragged away, resulting in the beak becoming extremely elongated.
1654
The data for Pikmin on the GameCube includes an unused model of a Goomba head, called "kuribo.mod" (the Japanese name for "Goomba") internally. While the model appears normal from the front (left), turning it around reveals that it has a second face on its back (right).
1655
When the Ultimate Unauthorized Nintendo Game Strategies book (left) was published in Mexico, the cover was redrawn to include Mario who, to avoid copyright issues, has a sheet over his face and the logo of publisher Ventura on his cap instead of his usual emblem (right).
1656
In a piece of Mario Party 5 promotional content, Wario and Waluigi feature as candidates for treasurer for rival political parties. This promotion is unique due to Wario and Waluigi being on opposing teams, and the highly unusual characterization of Wario as having "credibility".
1657
There is an unused animation in Mario Party 8 that differs from all other animations in that it does not exist for all playable characters. Instead, the only ones that have it are Mario, Yoshi, Birdo and Boo. It is possible that a special scene existed involving only these four.
1658
The Japanese demo version of Paper Mario: The Thousand-Year Door includes more content than can normally be seen. If a Peach cutscene is accessed, Grodus's model is revealed to be missing. Instead, he appears as the small dialogue window star (left: finished game, right: demo).
1659
Losing mugshots of all characters from Mario Kart 64.
1660
Mario, Sonic the Hedgehog, Shadow the Hedgehog and Bomberman at the final Nintendo Space World trade show in 2001.
1661
If you are in possession of any further information about the Super Mario Knife, please contact me so this post can be amended!
1662
In Mario Party 4, the eyebrows of playable characters disappear during some animations. While characters' eyebrows are modeled separately from their bodies in all GameCube Mario Party games, only Mario Party 4 contains instances of them visibly disappearing during gameplay.
1663
In Super Paper Mario, the Power Plus item raises the party's Attack by 1. During this, a "+1" arrow appears above the character (left). However, in the special case where the stat is already 99, a unique "+0" arrow appears instead and the item is wasted with no effect (right).
1664
In Super Mario Maker 2, the "Super Mushroom" voice sample does not follow the tune of the music in the Super Mario Bros. style, despite doing it in other styles and other samples following the tune in the same style. Thank you to @FaceofCoffee and @RMaster94 for the information.
1665
Left: the emblem on Mario's cap in Super Mario 64. Right: the emblem on the Mario 64 cap in Super Mario Odyssey. The emblem has been altered to remove the asymmetry present in the original.
1666
In the Super Mario Maker games, Mario can enter doors one tile off the ground by standing on a Rocky Wrench's head in the New Super Mario Bros. style, but not in any others since the Rocky Wrenches there are a few pixels shorter. Winged Rocky Wrenches can be used in all styles.
1667
A 1985 print ad for the Nintendo VS. System, a multi-game Nintendo arcade hardware, features 15 pictures of Mario with different appearances showcasing the various games. For "VS. Ladies Golf", a golf game with only female characters, a unique design of Mario as a woman is shown.
1668
While this has not been officially confirmed, it is possible that the names of the 11F bosses from Luigi's Mansion 3, Nikki, Lindsey & Ginny, are a reference to the initials of the game's developer, Next Level Games, as the characters have the same initials in several languages.
1669
Correction to the previous Tweet: I had mistakenly claimed it is Mario who is 3D in NSMBU and 2D in Super Mario Maker 2; it is in fact the goal pole itself that is 3D on the left and 2D on the right. I apologize for the error. Thank you to everyone who offered corrections.
1670
NBA Street V3 for the GameCube allows the player to start a match between two completely identical teams of Mario characters without using alternate palettes or other visual indicators to distinguish them, possibly resulting in confusion.
1672
Super Mario RPG contains a debug menu called "UFUFU", accessible by modifying the game's code. The menu has three options, "MAGIC", "LASTER", and "BGLASTER". Selecting "LASTER" makes this Boo sprite appear, which changes between different distortions by pressing Left or Right.
1673
The data of Mario Party contains two entirely functional, but ultimately unused gameplay modes: one for playing only the board game portion of the game without the minigames, and one for playing just the minigames without the board game. Details below.
1674
Unused graphic found in the files of Mario Superstar Baseball, possibly used as a placeholder for the title screen during development. The image features crude sketches of Mario and Luigi and the text "ルイージの兄野球", which translates to "Luigi's Brother Baseball".
1675
From a Christmas-themed comic in the Dutch Club Nintendo magazine.
Additional obscure Mario content for suppermariobroth.com.
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