• Bad Export for You: The Wii U Virtual Console release of Super Metroid in European and Australian territories. It is the 50Hz PAL version being forced to run at 60Hz, which introduces new glitches that aren't present in the Wii U release in other regions and weren't even present at all in the original PAL release.
  • Fan Nickname: A handful of rooms in Super Metroid, such as "Noob Bridge" in Green Brinstar, and "Mount Doom" in Black Maridia.
    • Also, Shockness Monster/Serris in Fusion, and El Pollo Loco/Little Birdie/ Clone!Ridley in Other M.
  • Hey, It's That Voice!: In the Japanese version of Metroid: Other M, Samus is voiced by Ai Kobayashi, who also voiced Deunan Knute in Appleseed movies. This is also counts as funny at first sight, since Deunan and Samus share similar backgrounds and similar screwed-up pasts.
  • Keep Circulating the Tapes: For years, Metroid II would not see another release. That is, until the Nintendo eShop for Nintendo 3DS came and Nintendo released it!
  • Urban Legend of Zelda: Many minor ones, but here are some of the most major:
    • The belief that the infamous Justin Bailey code had an actual meaning, instead of being just a random result of password calculations.
    • Replica Justin Bailey codes in Metroid II and Super Metroid. This eventually resulted in fan-made Game Mods in honor of the fruitless searching.
  • What Could Have Been: The 2001 E3 preview of Metroid Fusion, at that point simply titled Metroid IV, looked quite different and drew a great deal of criticism for looking like it belonged more on the Game Boy Color rather than the Game Boy Advance. With that feedback, Nintendo went back to the drawing board, and at the next year's E3 ran a preview looking much more like the finished game.
  • The Wiki Rule: Metroid Wiki and Wikitroid.
  • Word of Dante: In official media, the only Metroid Fusion enemy with "-X" attached to the end of its name is the SA-X. Yet, it seems almost universally accepted among the fandom that creatures infected and/or mimicked by the X parasites follow that naming scheme (Hornoad-X, Geemer-X, etc). It's not clear if this originates from an obscure official source or if it is simply fanon that has become so well known that it's nearly indistinguishable from canon.
  • Working Title: For the NES game, it was originally going to be called "Space Hunter".