Revealing mistake: When Les' mom is doing the laundry and "finds" the Test Failed notice, you can see that she actually had it in her hands the entire time. She transfers it from one hand into the other, then puts the hand with the paper into the pocket and pulls it right back out, then knocks it off onto the floor, and acts surprised.
Revealing mistake: The "unconscious" driver can be seen turning his head toward Les at least twice as Les tries to get in the car through the window. But, obviously, he's making sure he's keeping the car in the right place.
