This movie never addressed the Fermi Paradox
This movie never addressed the Fermi Paradox, which is critical when you're discussing aliens.
If the universe is so big (which this movie emphasizes with the, "Awful waste of space" line) and life is so common, then why haven't we seen any aliens whatsoever? Our planet is just 4.5 billion years old, and the universe is 14.5 billion years old. If there are aliens, then they are likely much older and more advanced than we are, meaning they have the technology to travel / communicate from afar.
The Milky Way Galaxy is only 100,000 light years long and 1,000 light years thick. Even if you travel far below the speed of light, you can colonize the whole galaxy in a few million years, which is nothing compared to a billion years. If life was so commonplace, then the aliens would have been all around us.
The movie addresses the fact that the universe is big ("awful waste of space") without acknowledging the other implications of that size (Fermi Paradox).