Factual error: Jim Bob is shown communicating with friends in the UK via amateur radio. During WW2 amateur radio operators in most countries were prohibited from transmitting any signals until after the end of the war.
Factual error: After Jason tells Olivia that he's giving up playing his music because he doesn't think he has a choice, when it cuts to the exterior shot of the rooming house, the vehicle parked in front is modern. The same type of thing happens later, when John rescues Pip from the airfield there are modern vehicles, etc, on the street in the background. (00:34:30 - 01:29:30)
Continuity mistake: When Pup and Tess are on the runway and John runs to save them, they huddle as the plane passes. After the plane passes, they stand up but you cannot see the airplane that supposedly just passed them. (01:29:35)
