Tom states that the Republic of China released fifteen American POWs in 1955. The People's Republic of China (Communist China) might have done so, but the Republic of China (Taiwan) has always been an American ally and would not have been holding any Americans prisoner to begin with.
When Jack is sunbathing in the backyard and is spotted by the lady neighbor, there is a shot with a plastic septic tank in the background. Back then septic tanks were made of concrete.
In one scene Gunny watches King Kong (1933) and is terrified by a scene in which Kong munches on one of the natives. That scene was deleted from the original theatrical release and not restored until the 1970s (Three Wishes takes place in 1955).