My point is that just because you exclude pop songs form a movie, doesn't automatically make it timeless. Many societal trends will be apparent in most movies through cars, fashion, technology, etc. Those are things that you can't escape for the most part. Most movies that feel "timeless" are mainly sci-fi or period pieces, but even then, after awhile, the technology that made the movie alone will show its age. Just look at Star Wars. It's almost in a timeless setting, other than the fact that some of the technology looks wonky and dated, because that's all they had to use in the '70s.