Ok I got the needed "Clarification" directly from our FAA Legal Department:
In regards to hobby or Part 107 being allowed to fly directly over a moving car with a person inside:
FAA: Part 107 does not allow operations over a moving vehicle. When we say “over”, we are speaking about operating directly over the person or vehicle. Generally speaking, recreational flyers may not operate over people as I do not believe any safety guidelines by existing aeromodelling organizations allow it.
"Film Crew" is NOT exempt from the "not flying over people" portion because they are not part of your "Flight Crew".
FAA: Your interpretation is correct. AC 107-2 specifically addresses this concept by stating that a UAS may not be flown over people who are not “…directly participating in the operation of the sUAS, such as the remote PIC, other person manipulating the controls, a VO, or crewmembers necessary for the safety of the sUAS operation, as assigned and briefed by the remote PIC.” People involved in the “production of footage” would not be considered necessary for the safety of the sUAS operation, or directly participating in the operation of the UAS.
Hope this helps shed some light on how and why it's illegal to fly over a car (your car or someone else's car) with a sUAS in the US.
Allen