Revealing mistake: When Frank yells stop to Marion, you can see the marks on the road from a previous take. (01:05:20)
Revealing mistake: When Lorraine dies after being shot (among other things), you can see her breathing clear as day.
Visible crew/equipment: Just after Frank is shot there is a point where Marion rushes out of the car in search of Frank. When she does, a stage light is reflected clear as day in the door. (00:49:20)
Revealing mistake: When the car skids to a halt when they are chasing after Brad, for the speed they are traveling, the braking distance is way too short to be realistic: 85mph to 0 in the space of three car lengths on a wet road. (00:16:35)
Continuity mistake: When the family first discover the pram on the road after Brad has been killed, its position on the road changes between the first angle and the second angle from the car. Note the wheels and the yellow line. (00:26:25)