One of the villagers tells you that nothing will happen if you press up, up, down, down, left, right, left, right, B, A. This button-combination is a cheat that works in almost every Konami game.
Shameless plugs abound!
In the Amusement Park stage (Stage 3), there's a Game Center that carries a game that you'd NEVER expect to cross paths with...shall I say it?
The entire first stage of Gradius is hidden in Mystical Ninja as a Game Center mini-game!
But we'll forgive that, for this is a Konami game within a Konami game, and that's cool.
Goemon and Ebisumaru were renamed to Kid Ying (!) and Dr. Yang (!!) in the U.S. version.