In the highway chase scene, there are no people in some of the cars that are stopped on the highway.
During the chase out of Oakland, Leroy's driver is shot by Jax and as Leroy's Caddy crashes into the traffic jam they sideswipe a tan Nissan before hitting a blue SUV. Just as the truck comes to a stop, you can see the camera from the next frame visibly mounted to the tan Nissan drivers side rear fender then immediately changes over to that cameras view.