Small Mario Findings

Near the end of Mario & Luigi: Brothership, Bowser's Castle becomes inaccessible, and remains such forever on that save file. However, it is possible to clip into the castle and explore it as usual if the Fire & Ice Bros. Move is performed in a specific spot near the door, as shown in the footage.

The catch is that while it is possible to enter the castle in this state, exiting it is not actually possible at all, since the game will turn into a black screen with no way of escaping it if that is attempted. As such, saving inside Bowser's Castle after clipping into it will make the player's save game permanently broken, so saving after doing this glitch is highly unadvisable.

Source: Alfredo18

The internal name for Paper Mario: Color Splash is "gojika", which is most likely a Romanization of 午時花 (noon flower), which is famous for its distinctive 5 petals. This is almost certainly a reference to this game being the fifth in the Paper Mario series.

Source: info

In Super Mario World, many glitches exist that allow Yoshi to eat unintended objects, some of which end up placing unintended items into the item reserve box. One very commonly used application of this is placing a Magic Ball into the reserve box, which normally appears only in the Sunken Ghost Ship and instantly wins the level if touched.

If the Magic Ball is released from the reserve box inside a bonus game and collected, the bonus game will be "completed" in the same way a level would be, instead of being "won" the regular way. This is, of course, not intended and will cause the bonus game room to reload, except without the blocks that comprise the actual bonus game in it. Mario will be trapped in the empty room forever until the game is reset.

Note that -the pipe in the upper left is an exit-only pipe and cannot be entered -there is no timer so Mario cannot die from the time running out -pressing Start + Select does not work so none of the potential ways of leaving the room are actually possible.

Source: Wingcapman

Box artwork for an officially licensed 1986 Famicom-themed mahjong game from Japan, featuring some redrawn and even unique Mario artwork like the Bloopers on the bottom.

Source: chriscovell

Model of the "Spiked Beetle" enemy from the Nintendo Switch version of The Legend of Zelda: Link's Awakening, one of the many Mario series references in that game.

The Spiked Beetle is nearly identical to a Spiny, except for its shell/spike color scheme, and having eyes that are neither angry like a Spiny's, nor darkened and glowing like a Buzzy Beetle's or Spike Top's. The friendly appearance most resembles a Para-Beetle's eyes.

Source: Centrixe the Dodo

Top: in Orbulon's stage in WarioWare: Get It Together, completing a microgame briefly displays a variety of cutouts of various cultural items from across the world, before they fly away. These are never seen in a way where they stay still on-screen, and always overlap each other, so it is not possible to get a good look at them unobstructed.

Bottom: the actual graphics for the cutouts, extracted from the game's files. All of them appear to be stock photos, except for the Orbulon version of Edvard Munch's 1893 painting "The Scream".

Source: DogToon64

Officially licensed 1989 "Team Nintendo Power" T-shirt, featuring Mario.

Source: davesfreshlyused

(Footage contains rapid camera rotation that may cause nausea)

In Donkey Kong 64, the animation of the Kongs entering a DK Portal features the camera rotating while the Kongs appear to be sucked into the portal, becoming smaller as though rapidly traveling away from the screen.

However, in reality, the Kongs are not actually moving into the portal at all, and are instead physically shrinking to simulate that effect. This can be seen directly by throwing an Orange Grenade into the portal so that it rebounds and hits the Kong after touching the portal. As seen in the footage, Tiny Kong is knocked out of the spiraling animation, which briefly shows how small she has become. Unfortunately, this only lasts for a second before the room unloads due to the portal activation.

Source: Mauzasaurus

Front and back cover of a 1986 Japanese guide for Super Mario Bros., featuring unique illustrations.

Source: pukuzone

Extremely simple test map found in the files of Luigi's Mansion 3, featuring Luigi on a cube with all the ScareScraper items.

Source: Dr18

In Super Mario World, glitches exist that allow Yoshi to put an unintended object in his mouth, which will corrupt the game if it is spat out while on a rotating platform. Normally, a corruption results in a crash with no parts of the game working after this.

However, rarely, an interesting form of crash occurs whereby the graphic engine is no longer running (the screen is frozen) but the sound engine is still working, cycling through music or playing sound effects in a random manner. Here is a sound recording of such a crash.

Officially licensed Mario skateboard.

Source: lisac3700

Top: in Paper Mario: The Thousand-Year Door, the second part of the Hooktail battle is unique in that it takes place in front of the stage rather than on it. Since Mario needs to be on stage for the level up screen, if he gets a level up on this battle, he (and his current partner) will actually walk offscreen backwards before appearing on the stage.

Bottom: this was fixed in the Nintendo Switch version, where they turn around and walk away normally instead.

Source: zonaljump1997

Scrambled name activity from an officially licensed 1990 Super Mario Bros. 3 coloring book.

Source: J. Gray Dingler

Rare officially licensed 2008 Yoshi plush toy from Japan, created only to be dispensed as a claw machine prize and forbidden from being sold at retail.

Source: Djinte

Mural of Mario and Luigi greeting visitors at Narita Airport in Japan.

Source: ultimatentomologist

Officially licensed 1989 Super Mario Bros. pinball toy with sliding panels.

Source: etbl-1370