Unlimited Combos:
At the character select screen press and hole L1 and R2, then tap 
SQUARE, X, O, then Triangle, then a COMBO meter should show up right 
below the picture of The SUPERSTAR that you're going to pick! Every time 
you press a BUTTON the Combo Meter will show up!

Bam Bam's Fire Throw:
When opponnent is on the ground recovering get above him and press 
D D PP or instead of PP try P