Complete all optional sidequests

Ask every person you possibly can out to prom

Listen to every one of Bernie's "Prune Swirl" insults

Find both Ted Bear locations in Part 1

Help the Janitor by ruining Beverly's date

Deliver porn to Stevie Shades

Give a condom to a boy in need

Trick Patty into believing Ms. Puffs stole her lunch, then witness the beatdown

Gain access to the girl's locker room.

Distract Patty by making Starsky & Hutch get into a fight

Stand in one location without moving for 30 minutes

Use the retinal scanner in the Secret Lab

Acquire the lab technician's eyeball