To be able to understand the quality of this movie, we may have to sit back, close our eyes and dial back into a time where moon landing was a new achievement, a time when there is still 4 years to go before the first VHS is sold and 3 years to go before P6060, the first preassembled PC is sold with a whooping 48 kilobytes of RAM...
All I want to say is, in those days technology was less and expensive, most of the movie was dependent on precise direction and acting with no jazzy Image stabilization and pop filters in the market. For that time, it's a masterpiece!!!