In one of the levels, there's some white platforms; if you crouch for about ten seconds on the last white platform before the end of the stage, your character will fade into the background, and you can run behind everything, then a Toad gives you a whistle.
For the second whistle, you have to have a raccoon tail for the first dungeon, and fly over the ceiling and enter a doorway (you can't see it, because you're on the ceiling, so you just hit up).
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