I posted awhile back that one of the WW's takes you off screen without scrolling it, thus bugging the game. It was fixed in the last version, but made a comeback. On another note, whenever I use a whistle combo to trigger secret combos, they only last until I go off screen. Nothing I've tried thus far has gotten it to be saved.
Whistle warp bugs
This should have been fixed by DN in a recent build.