Vega

Flip all over screen:

Difficulty: Easy

Status: I've done it in the arcade many times, never on Callus (I haven't tried yet).

Description: You flip all over the screen like crazy.

Why do this: Its an easy glitch.

How to do this: On the bonus stage where you destroy the barrels, destroy the first one on the left side. Then wiggle the joystick back and forth (to do Vega's flip). He will begin flashing all over the screen. He stops when you stop wiggling the joystick.

Also here is an alternate (thanks to Will '98):

First, destroy the oil drum on the left hand side then pull the   joystick in the DOWN position and press HARD KICK to slide into the drum. During the slide, tap the joystick BACKWARDS twice in succession and Vega will do his backflip and drop down the screen.  (No need to wriggle the joystick back and forth)  He only stops after a while; he falls down the screen fast and then steadily slow doen before landing. I managed to do it twice in the oil drum bonus stage round =P

I have not tested this yet, so I cannot verify its validity.