Lack of shine on paint and general "blah" look due to a combination of underexposure and use of polarizing filter. I'll know better next time!
Our family, coincidentally, got its first car, a green and white Pontiac, in 1954. My father drove it very infrequently and sold it at the time The Godfather movie was being made. The new owner was stopped one day when he was driving and asked if it could be used in the film, which it was.