I'd say it's fine to list them. They're not ordinary background vehicles and seem to be shown deliberately. Less sure about how they should be rated, a couple are shown being driven by people who could be considered characters so maybe [*][*] for those ones?

Some people don't realise that a background car can have a minor role or be set decoration which would justify them being listed for music video.

Surprised the Metallica one isn't listed yet, that's a very well known song.