When Charlie is outside the bus answering his cell phone, you can see that the incoming call from Dani Reese is misspelled "Resse" on the phone's display screen.
Hannah's corpse breathes: you can see the earring move.
Dale Houseman and Ben Mosby, both born March 17th in different years. Both had their drivers license issued on the same day, Apr 15 '01. And they both expire on the same day, their birthday, Mar 17 '09. Isn't 8 years a long time for a license to run?