A bunch of random I know of

[Nuudoru]

Earhhbound
- In the beginning of the game when you choose the name for the characters you hear a voice going "Ok-sska". It's actually a recorded voice of the game's creator Shigesato Itoi. He had no idea it had been implanted into the game until the game was finished. Since it sounded silly he thought it fit with the games theme and let the sound director keep it there.

*MAJOR SPOILERS*
- The dialouge spoken by Gigyas at the end of the game comes from a horrible exerpience Itoi had as a child when he sneaked into an adult cinema. When he got in there he witnessed a rape scene and murder in a movie. I can't remember the title of the movie, but if you look up this fact I'm sure you will find it. It's famous in the Earthbound community.

Pokemon
- In Japan the default names for the protagonist and antagonist is Satoshi (protagonist) and Shigeru (antagonist). They are named after Satoshi Taijiri, the creator of Pokemon, and Shigeru Miyamoto, the man behind Super Mario, Zelda and many other famous series. Satoshi admitted in an interview that he always saw Shigeru Miyamoto as a rival and that's why he chose those names.

- Satoshi Taijiris favorite Pokemon is Poliwhirl. That is why the protagonist of the Pokemon Adventure manga has a Poliwhirl as his first Pokemon.

Pikmin
- Shigeru Miyamoto designed the Pikmin stages while looking at his garden. In an interview he said that it's basically his garden with a few changes.