When sorting one's game library alphabetically on the Nintendo Switch OS, Luigi's Mansion 2 HD is sorted after Luigi's Mansion 3 despite preceding it numerically. This is because the title for the former uses a different apostrophe symbol (’) compared to the latter (').
In Super Mario World, the 1-Up Mushrooms that appear during the bonus game cannot be eaten by Yoshi. This is not the case in the GBA version of the game.
Birdo's Japanese name "Catherine" (though romanized as "Cassarin") can be found within the game data of Mario's Tennis (Virtual Boy), implying she was originally intended to be playable.
In the North American manual for The Legend of Zelda for the NES, two screenshots in the “Erasing an old Link character” section show the save files being named “NINTENDO”, “MARIO” and “LUIGI”.
The back of the North American packaging for Super Mario Land mentions “giant crabs” appearing as enemies in the first paragraph, despite no crab-like enemies appearing in the game.