Uninteresting/background: it is hard to tell what are the uninteresting ones, but for video clips I usually tend to skip background ones.
But if some very interesting background vehicles are seen, then they may be worth listing? like that custom built Volvo?

About year: many music videos miss the year currently on the site anyway.

Anyway about the fact of spending several hours, it is maybe better to not make all the captures in one time, but rather do them few at a time, so it lets us time to add these to the site.
Or first do those that are the most interesting for the site : the cars used a lot in the video and/or the well known songs, then see case by case for the others.