Corrected entry: When Linda Voss meets Ed Leland at a party of the US Army six months after the war began, they are dancing to the song "I'll be Seeing You". This beautiful song was recorded in Feb 17, 1944. It entered the charts two months later, where it stayed for 24 weeks, topping the charts for 4 weeks. They were dancing to a song 2 years before it was recorded.
Corrected entry: The flag in Douglas' office when interviewing Griffith is a 50 star flag instead of the 48 star version.
Correction: The flag has 48 stars, not 50. Even though it's hanging down and folded over on itself and you can't count all the stars, it's simple to tell. A 50-star flag has 9 alternating rows of 6 or 5 stars and a 48-star flag has 6 rows of 8 stars. The shot of the flag I see, it's partly cut off from the fold, but I can count at least 7 stars in a row, meaning it's impossible to be a 50-star flag.
Correction: The song was published in 1938, and was popular during WW2.