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• Starfy is neither a star or a starfish.

• Starfy made a cameo as an elusive enemy named "Starfish" in the Nintendo DS Mario game Super Princess Peach, likely because TOSE worked on developing the game.

• In Densetsu no Starfy 3, Wario from the Mario series makes an appearance as an ally of Starfy, where he helps him get through the Undersea Ruins with three of his transformations; Flaming Wario, Bubble Wario and Puffy Wario. He also teaches Starfy's equivalent of his Groud Pound ability; an enhanced version of the Shooting Star ability.

• Konk, the first secret boss of the The Legendary Starfy is actually a recurring character and enemy/rival of Starfy in the Legendary Starfy series who has acted as the first boss in every Japan-only game.

• In Mario & Luigi: Superstar Saga, Starfy makes a cameo appearance on a movie poster titled Legend of Stafy.

• Densetsu no Starfy, the first game in the series was originally made for the Game Boy Color rather than the Game Boy Advance.
  • It was shown at Nintendo Space World 2000, with various differences from the final game and a working debug menu.

• In the Japanese version of Donkey Konga, one of the available songs is "Densetsu no Starfy". It is actually the Legendary Starfy series Title Song (also known as Tone of Ocean) sung by Becky. Tone of Ocean is the main theme of the The Legendary Starfy series.

• In Densetsu no Starfy 4, there is a Special costume for Starfy and Starly called Princess and Umbrella that is based on Princess Peach. Starfy or Starly also holds Perry, the parasol from Super Princess Peach.
  • The costume was one of the winning designs of the Wanted Kisekae contest, a contest where people would send in their designs for Stuff to Nintendo's headquarters, with a chance of them appearing in the final game in some way. It was designed by Eriko Kawashima.

• Starfy, Starly and Moe own a Wii, known as the "Fii" with a game resembling Wii Sports in the Densetsu no Starfy R manga.

• Satomi Kōrogi, the voice actress of Starfy and the Mermaid is also the voice actress of Pokémon such as Pichu and Togepi.

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