"You are the Bravest of Them All!" mesage
Once you complete level, go back and do "Bravest Of Them All". That is where you have to catch all the Heffalumps and Woozles. Catch every single one in the dream and it will say "You are the Bravest of Them All!"
Infinite time in Tigger's level
In Tigger's dream, when you have to catch his stripes, run out of the haunted house when the clock is still ticking. Go back in and you will have unlimited time to catch the stripes.