Lots o' Hearts:
On World 1 level 1 pick up the dinosaur by going on top of him and pressing B. Then every time you throw him a heart comes in the area that he landed.
On level 6-6 level 2, if you kill the snakes in the way and pull a shell out of one of the vases. Just throw the shell into the way of the vase that has guys coming out constantly. It will give you lives and if you wait, it will give you 99 lives.
(supplied by: Joe_almighty)