In Donkey Kong Bananza, signs appear that indicate that Tiny Kong owns a bank. The 1999 official German website for Donkey Kong 64 claimed she was a tax official and managed the savings of DK Island. Whether this is a deep cut reference or an astounding coincidence is unknown.
In Mario Party, minigame descriptions treat being eliminated merely as being out of the game, except for Bumper Balls, which shifts the tone by stating the winner is the last one left alive. This implies that while other minigames might be for fun, Bumper Balls is to the death.
Some areas in Paper Mario feature a rim lighting effect that is achieved in a manner that is extremely simple for the surprisingly effective results it produces, being simply shifting around a shadow copy of the sprite.
Mario & Luigi: Brothership contains an extremely cute model of a decorative baby penguin that appears only outside the playable area and is never seen up close. Below is a detailed view of the model to appreciate the penguin.
In the spirit of April Fools' Day but without sacrificing the Supper Mario Broth veracity policy, here is a fact that seems so outlandish as to be a joke, but is actually true: in 1993, a Swedish Sega ad campaign briefly planned to use profanity to slander Mario.
Apparently there's gonna be some new Pokemon animations in Champions as well, like more impactful hit animations
Maushold is getting way more yeeted in Champions compared to ScVi
In Super Mario Odyssey, many Goombas can be stacked. The limit for a legitimate Goomba stack is 30, as they will stop spawning afterwards. Manually spawning more Goombas reveals that the limit for an illegitimate Goomba stack is 200. At 201 Goombas, the game crashes.
In Mario & Luigi: Superstar Saga, the Mini-Mario ability prevents music from changing properly in some cases. This can lead to a variety of unfitting music scenarios such as "Mournful Surfing", whereby Mario will surf joyfully at a sunny beach while tragic music is playing.
In the Japanese version of Mario Kart World, the "SPECIAL test of skill" missions are named "Even the Mario Kart staff were surprised!", a reference to the name of the Way Cool course from the Special Zone in Super Mario World. This is why the SPECIAL is in all caps in English.
An official Mario Kart messaging app sticker contains a one-frame Easter egg. For a fraction of a second during the animation, Mario assumes the same pose he does on the Mario Kart DS box art.
In Super Mario Sunshine, each plank of the Pianta Village bridge has separate collision for an unknown reason. This causes microscopic invisible gaps to form between the planks that extremely unfortunate players can slip through and die. Below is a compilation of such cases.
There is a humorous error message in Paper Mario: Color Splash. When loading Luigi, the game does a quick "bone check" to see if his position is defined. If he fails his bone check, the developer console prints out "Luigi is elegal!!", likely a misspelling of "Luigi is illegal".