When Meredith is being examined by Cristina, her hands change positions several times. In some shots, she has one hand behind her neck and the other across her chest, while in others she is seen clutching her stomach with both hands.
When Addison is trying to convince her patient to get a C-section and she starts screaming at her to get out, Addison complies. But when the shot switches and it shows her walking out the door, you can see the patient behind her, not talking (even though the audio has her yelling), and obviously not frustrated as her husband is caressing her.