Mario has other things on his mind.
Somewhat funny, but I also like the subtle instances of humor as well. I noticed that note on the side of Warts castle before the Mouser scene, though I didn't pause in time to read it. But this movie had a bit of a new twist. Normally the must-retrieve item does SOMETHING, but the Golden Mushroom didn't even give him (Wart) crazy gas! (All of that was his own)
So, really, it was just a gold, ancient, overly-guarded Mushroom?
I guess I'm still left a little confused.