Defeating the Ghosts

Fatso near kitchen: Feed him hamburgers.
Stinky: Spray perfume on him.
Stretch: Use Glue.
Fatso in bathtub: Use Camera.
General Fatso: Use wind up key then hammer the tanks.
Farmer Stinky: Use hammer and chisel to carve the stone in Casper's Image.
Graveyard Stretch: Use twister morph to lure him into grave dig site.

Drift
     Go  to  the top-left corner of any room, then hold Up/Left + L1 +
R1  +  Start.  If done correctly, the game should freeze. Then release
only  Up/Left and L1, keeping the others still held, press Down/Right,
Triangle.  The  game  will  unfreeze and you will hav e the ability to
drift over any wall by press R1, L1 will bring you back down.

Faster Movement
     During  gameplay,  hold  Triangle  and  press  X, R1, R1, R1. The
Inventory  screen  will  appear,  don't  worry, just press Triangle to
resume play.