There is a secret room, called the Chris Houlihan room, that is not accessible via normal means. It contains a telepathy tile and 225 Rupees and is used as an error handler if you fall into a hole but the game can't find a proper destination.

This room appeared as a result of Chris Houlihan winning a Nintendo Power contest and being promised an appearance in a Zelda game. Many of the glitches used to access the room were removed in the GBA port though, along with any mention of Chris.