At 42:20, John tells John-Boy that he was at Verdun, which is impossible as the Battle of Verdun (February-December 1916) was fought between Germany and France, not to mention the US didn't enter World War I until April 1917.
At 17:20, spots and smudges are clearly visible on the rear projection image of the airfield behind John-Boy and the reporter.
Olivia wasn't present during John Boy's tribute in the living room.
1970s-era cars can be seen parked in front of the hangar at the airfield.