Other mistake: When Mimi is in hospital Lucy stands at the door and Mimi has a tube in her arm. Then when Lucy goes over to the bed the tube has disappeared. Then later it appears again.
Other mistake: Right after Britney visited her mother, she goes into the washroom and cries. The lightswitch in the washroom is "off" and even if there was a window in the ceiling - it was raining outside. So how is it possible that there was light in the washroom above the bathtub?