I decided to go through this old favorite on the Wii VC just to see if I've still got it. I was surprised that the ending where the castle falls was not animated correctly at all (it doesn't actually fall, but you can see it try to). Also, the wall jumping is much more difficult using the Wii controllers (most especially when you jump up a vertical "non-ladder" wall). I don't know if it is bad emulation or just the controllers, but It seems to be way easier on an old NES pad.
That is all...just wanted to air a little frustration. The game never does get old, though! Still awesome.
-Rob