Continuity mistake: When Caroline first arrives at the house for her interview, she closes her car door and it cuts to her reflection walking away from the left hand wing mirror of the car, as if she is walking to the back of the car. The next shot, however, she is walking away from the car door which is directly behind her (rather than the car boot). There is no way she would have been reflected in the wing mirror if she was walking at this angle.
Continuity mistake: When Caroline is on the bus circling the newspaper ad for hospice caretaker, there is a black man, wearing a blue shirt, behind her in the next seat. In the next shot from the outside of the bus, that man in the blue shirt is gone. (On the DVD, there is a short deleted scene of the bus stopping between these two shots, allowing for the man's "disappearance" but it is still a continuity error within the film.)