Shrek 2

					
Some Kinda Hidden Fairy
In the second book, second level, you can turn around and jump onto a platform with 2 coins. if you keep going there is another platform with a fairy and a little health. the fairy can help you get to the mini game, and jump onto the bushes over the enemies that you can't kill.
Bullet Bounce
When you playing Shrek as a human, you can bounce back the green glop that shoots out of the guns from the midgets in the factory. just press B against it, and it shoot back to the enemy.