When Sheldon is wiping the table before opening the door for Dr. Plimpton, the spray bottle keeps switching between his hand and the table.
When Howard goes to Raj's, only to find Elizabeth there, Elizabeth's legs are crossed/uncrossed between cuts of her sitting on the couch.
In the cafeteria, when Raj asks when he can sit with the guys again, after getting his response he turns away twice.
Sheldon's cereal bowl refills itself.