Free Coins from Mushrooms - If you use a Mushroom item, and hit the same number on both dice, you get a free 10 Coins.
Free Coins from Gold Mushrooms - While using a Golden Mushroom, get 3 of the same number, and you'll get 20 coins, if you get 3 7's, you'll get 50 coins!
Secret Names - Pick a file, while entering the name, don't put anything. While doing this, it will randomly put a Nintendo's character's name
Taunt - Press L
GLITCH: Misspelling - Go to the Sound Room, then go to the Parrot Box and turn the pages until you see Toad, it will say "More Diappointment"
That's all I know for now, I will post more later on.