Delete a Message
There are sometimes some not worth listing that still are accepted, especially when there are a lot of these, a few slip in between the good ones 
About the sample Grand Marquis, isn't it still quite noticeable in the movie, because a guy is siting on it? Isn't the guy in foreground looking to him?
That one does not seem problematic to me.
There are of course some to delete, sometimes I delete a few way too background vehicles I find, usually these are rather blurry passing vehicles, random traffic vehicles seen through windows of a vehicle, or partial views of parked vehicles.
If you notice really bad ones, you can report them here, but don't report too many either, only worse case in a first time are enough
About the sample Grand Marquis, isn't it still quite noticeable in the movie, because a guy is siting on it? Isn't the guy in foreground looking to him?
That one does not seem problematic to me.
There are of course some to delete, sometimes I delete a few way too background vehicles I find, usually these are rather blurry passing vehicles, random traffic vehicles seen through windows of a vehicle, or partial views of parked vehicles.
If you notice really bad ones, you can report them here, but don't report too many either, only worse case in a first time are enough