Continuity mistake: When Ben slams on the breaks, causing Floyd to be thrown forward and hit his head on the windshield, watch closely. When he first hits it, you can see the glass begin to buckle out, and just before the shot cuts, it becomes quite obvious that the windshield itself disconnects from the car at the bottom and is breaking loose. Then only a moment later, the car is shown from an exterior view as it begins sliding out of control along the road, and now the windshield seems fine except for the blood and cracks. The separation at the bottom is gone, and the cracks are a lot less extensive.
Picture added by Quantom X