- Manual Misprint: The manual states that Samus has an infrared visor that lets her see in the dark caves of SR-388... except there are certain rooms that are pitch-dark so Samus can't see the floors.
- Serendipity Writes the Plot: The Varia Suit's Shoulders of Doom originated in this game due to hardware limitations. Because of the original Game Boy's lack of color, another way had to be devised to differentiate between the various suit levels, so the Varia Suit was given round shoulders that were hand-waved as being cooling/heat-shielding units for the suit. This development is later retconned into Zero Mission, where Samus doesn't get the round shoulders until she gets her new, more advanced suit towards the end of the game.
- What Could Have Been: A screenshot from an old issue of Nintendo Power suggests a Game Boy Color version called Metroid II was planned but never saw the light of day. This info took on a life of its own, resulting in the rumors of an Updated Re-release called Metroid II DX that never was.
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