Haley's lipstick gets noticeably thicker and thinner between different shots when she's talking to Nathan (when she drops over some groceries).
When Karen is helping Keith with his collar, her hands change places with the shots. When the camera is on Keith, she is fixing his tie. When the camera is on Karen, she is fixing the back of his collar. It goes back and forth multiple times with each change of the shot until the end of the scene when she is tucking the tie into his jacket.