Hint: Unlock Alternate Costumes 
     Some  fights  are  with a boss-like character. If you defeat that
actor  with  the  mirror version while earning three or more stars you
can unlock the alternate costume.

The "bosses" are: 

- Master Sho-Yu in Night Of The Living Fog 
- Ninja Fu Hiya in The Good, The Bad, And The Ugly Princess 
- Monkey in Enter The Dino 
- Chop & Styx in Gigantic Crack 
- Xui Tan Sour in Legend Of The Drunken Bastards 
- Lucy Cannon in Revengeance Day 

     If you complete campaign mode with Candi Roll or Captain Won Ton,
you unlock their alternate costumes.