Heh.
Debugging leftovers are just about in every finished game.. you'd be hard pressed to find a game that doesn't have some sort of debugger (or other unused content, there's always some), or remnants of one, in the finished game. Some pics..
1: Heh, in MM they took the hint from OoT and decided to leave those who found the debugger a little message. That or a bit of inspiration for the actual debuggers.

"congraturations" har har, great engrish.
2: OoT's debug screen
3: MM's basic debug screen