The movie was set in California. All police vehicles in every city of the state of California that are equipped with emergency lights, must have at least, one, steady red light, visible from the front of the vehicle, yet the police cars in this movie had only flashing red lights visible from the front.
The goof item below may give away important plot points.
I find it hard to believe that night after night Jessica goes home, drinks wine, passes out and does not recall anything the next morning even though she barely had a sip or two and she does not somehow figure out that she should stop drinking the wine because something is wrong with it. She is supposed to be this top notch detective and after the first two times that happens, she should have been able to put 2 and 2 together.