What tipped off the cops?
One plot point that I don't get is, why does the whole SWAT team come storming in at the end?
The best I can figure is that when the two cops came to the door earlier, Jodie Foster tried to talk them down, but they had a hunch.
But come on ... you don't call out the swat team for a hunch. I imagine most police would walk away after a 60-second "everything's OK" speech.