- Fan Nicknames: Since most of the enemy names were All There in the Manual, lots of nicknames sprung up, the most famous of which are "spagetti-os" for the Rinkas in Mother Brain's chamber. Energy Cheerios has also become popular, thanks to the Grumps.
- Game Mod: A lot. One that adds a lot of playability to the original game is Metroid: mOTHER, a Rom Hack which gives updated sprites, a map system, and beam stacking.
- What Could Have Been: There's a Dummied Out "Fake Ridley" enemy that is not present in the final game.
- Working Title: It was originally going to be called "Space Hunter".
Trivia / Metroid 1