Continuity mistake: At one point during the fight scene between Sam Caine and the intruder, they fight over a shotgun. When they both fall over the shotgun disappears. A sound effect of the gun falling to the floor is even inserted to cover up the fact that the shotgun just vanishes.
Continuity mistake: When Sam Caine teaches her daughter Caitlin how to ice-skate, Caitlin is pushed but falls on her knees. In the next shot, she somehow lands on her butt.
Continuity mistake: When Waldman is telling his wife Alice how disgusting her dog is, the way he holds his spoon keeps changing between cuts.
Continuity mistake: When Geena Davis stabs a man in the eye with a syringe, in one shot there's no blood on his eye, but in the very next shot there is.
Answer: A 1966 Ford Galaxie-500 XL. There's a website that lists the vehicles used in the movie.