I watched this weeks' message of the week and James Keyes stated that there would be a substantial price drop after it had been out for three weeks.
Michael Clayton may be getting the same treatment...
I don't know how coupons work at Best Buy but where I work if we scan a coupon that is expire the computer lets us know.
It appears that his photoshop worked meaning that either it didn't really expire on that date or that the cashier that he took it to had to overring the amount on the coupon...