Extra bonus battles:
When you are far in the game you will get some numbers. The numbers are the scenes you have to finish to go to the extra battle. If you follow the game as in the comic books or episodes you will get the extra two bonus battles against Mr. Popo and Kami.
Super Saiyin-jin Goku poster:
When you are in Bulma's capsule house, you can see a poster of adult Super Saiyin-jin Goku. on the wall near the bed.
Unblockable attacks:
To use unblockable attacks, make Goku flash before your opponent does, and attack just before they flash. Note: This will not work with Kamehameha's.