This was Eddie Robinson's 101st film and his last, and he died of cancer nine days after shooting was complete. All of which makes his key scene in the movie all the more poignant.
Although some of the hair and clothing styles are a bit dated (also note the video game shown in the film), but the subject of the film is pretty much timeless. Heston said he had wanted to make the film for some time because he really believed in the dangers of overpopulation.
Several things make this film a classic. The story is solid.
The acting is top-notch, especially the interplay between Heston and Robinson, with nice performances also by Cotten and Peters.
The music is absolutely perfect. The medley of Beethoven, Grieg, and Tchaikovsky combined with the pastoral visual elements make for some truly moving scenes. This was the icing on the cake for the film.
And the theme (or the "point") of the film is a significant one. Yes, it's a film about overpopulation, but on a more important note it's a cautionary tale about what can go wrong with Man's stewardship of Earth. It's in the subtext that you find the real message of the film. Pay attention to what Sol says about the "old days" of the past (which is our present), and note how Thorn is incapable of comprehending what Sol is saying.
This film is one of my top sci-fi films of all time.
