When Sheila defrosts the elbow in the first scene, the microwave begins counting down from 30 seconds. As she is talking to Joel, the microwave can be seen behind her alternately not on and then on, before it finally dings, 70 seconds after she turned it on (40 seconds too late).
Anne (Natalie Morales) puts the bracelets Sheila (Drew Barrymore) gives her on her right wrist. When the camera cuts to another view, she is finishing putting them on her left wrist.