Banquet:
Goto the main lemur that is on the drum where all the food lies. Talk to him 10 times in a row to earn food. This can only be done 2 times.

Flying Bird Mini-game:
When you are in level 3, go into the right subway entrance to find one of the arcade games.

Power Ups:
While playing, pause the game. Press B, A, A, B, Y, L, X, R, L.