When Debra goes to talk to the kids and turns off the TV, she sets the remote down on the table. It then cuts to a shot of Ray, then back to Debra and the kids and the remote has moved slightly.
When Ally claims Ray didn't notice her haircut (as a joke), some of her hair is hanging in front of both shoulders. In the next shot, all of the hair on her left is pushed toward her back.
When Frank takes his last bite of chocolate cake, his face stays clean. A chocolate stain then appears on his jawbone.