When Jo appoints Michael a salesman and Jim the manager, Jim's hair is unkempt. However, after panning back to Michael congratulating Jim, Jim's hair returns back to its usual brushed manner.
When Michael announces his sale, the door to the manager's office is closed. In the very last shot of the scene, the door is suddenly open.
When Dwight and Ryan are threatening Nick in the break room, the napkin dispenser on the table changes its position multiple times.
When Andy tosses a valentine at Meredith and supposedly gives her a paper cut on her neck, the card clearly moves beside her without touching her.