Bounce Trick
In the options menu, sub-menu "other", the age you enter determines how bouncy the gals are - the higher ( i.e., the more "mature" ) your age, the bouncier they get.

Extra options:
Press Start to pause the game, then press Triangle + X.

Fight as Bayman:
Complete the game with all original characters. Bayman can only be used where the two extra slots are for hidden characters; Survival, Time Attack, etc.

Expanded credits:
Complete the game with all the characters under the very hard difficulty setting.

CG Gallery:
Beat team mode with five characters.

Change winning pose view:
Press Triangle during your fighter's victory pose. Use the D-pad to change the camera angle, press Square to zoom in, or Circle to zoom out.