When Ellen brings Jay to meet her father, she enters the study with her hands tucked into her belt. However in the next shot, showing her from behind, her arms are by her side.
When Ellen discovers her sister's lighter among Jonathan's souvenirs, it lights on the first attempt. It is a fuel-burning lighter, which, after extended storage, would not have worked at all, the fuel having long since evaporated.
When Ellen and Jonathan take the injured homeless woman to the hospital, Ellen talks to a nurse and offers to pay the bill. First, the nurse is wearing a stiff white cap and uniform. Most nurses, especially in the ER, had stopped wearing this type of uniform by the time the film was set. Also, she gives the nurse the money for the bill. Nurses do not handle billing and collection in hospitals. Plus, she didn't seem to know how much the bill was. And no receipt?
When Ellen looks out at the railroad tracks just prior to the final confrontation, she sees a freight train with a long line of cars with bright green Carlsson Copper logos. The logos, however, are printed on fake-looking prop fabrics draped over the cars.