Factual error: In the scene where Daniel is flying the B-25 (Mitchell) to see Helen, you can see the propellers are turning much slower than needed for a cruising flight. Also, the sound of the engines is too low and keeps changing even though Nat and him are talking.
Factual error: In the scene where Daniel is taking off with the "borrowed" B-25 (Mitchell), they have two shots switched. It shows him taking off (a beautiful shot), and the very next shot it shows him adding power through the throttles. This should be reversed.
Answer: The color and design of the label hasn't changed in decades, although the script on it has changed some over time. They all look almost identical from a distance.