Collect all the Lums and break all the cages.
The Crows Nest: Wrong Lum count
On the very last level, the screen reads 0/0 Lums, but when you go in the level it will state that you have 41/40 Lums.
The Fairy Glade Part 1: Walk through wall
In level 2 when you are about to free Li, keep going straight where the first small turn is found. You should go through the wall. You will fall for awhile, but will eventually die.