To get the bonuses, you and/or your partner cannot use a continue. The bonuses are located just before you reach the final Boss.

If you choose the parking entrance, keep going until the "security guard" chases you twice. After the second time, look to your right and you will see three to four barrels. One of them has a bonus in it.
If you do well enough, you will get some boxes with items in them before you face the Wheel Of Fate.