Super Mario RPG: Legend of the Seven Stars Easter Eggs

1) Buy a Fireworks from the man in Moleville for 500 coins.

2) Trade it at the molekid's 'pur-tend store' for a Shiny Stone.

3) Go up to the locked door in Monstro Town and press A. The Shiny Stone will react and break the seal. Go in.

4) You... more

Link:
1.Play Mario RPG like normal up until you get the second star.
2.Go to the Rosa Inn.
3.Go to the beds, and there he is!
4.Talk to him for the Zelda 'Mystery' Noise.

Samus #1:
1.Play Mario RPG like normal up until you get the fifth star.
2.Travel... more