Farmersboy

Factual error: Ian Fleming explains to March-Phillipps that the U-boats need "fuel and torpedoes, but they also need carbon dioxide filters, for oxygen." U-boats didn't have CO2 filters. They had the air on board when they dived, which, along with the batteries supplying the electric motors they used when underwater, limited the time they could remain submerged. There were several instances of U-boats being forced to surface after long periods of being depth charged; their air supply had been exhausted. (00:12:00)

Farmersboy

Factual error: The four-barrelled Flak gun is shown running out of ammunition, namely a belt of rounds. This is most likely intended to be a Flak 38, which used twenty-round magazines, not belts. It had a relatively low rate of fire as the magazines had to be constantly swapped out, and two barrels were usually fired at a time. (00:16:58)

Farmersboy

Factual error: This is supposed to be an F-35B, the STOVL version with the additional lift jet. The B model has no internal guns, let alone two firing from the bottom of the air intakes. The only gun it can carry is fitted in a multi-mission pack attached to the belly. (01:54:25)

Farmersboy

Character mistake: As Teddy is announcing the bad news, he calls Mark Watney 'Mark Watton'. (00:09:48)

Farmersboy

Factual error: In the last minutes of the film, as Memphis Belle is coming in to land, you just catch a glimpse of a very big hangar. This is Hangar 1 at Duxford, the Imperial War Museum where a lot of the flight filming was based at, and was built in the 1980's. This hangar was rebuilt and enlarged and is now called Airspace.

Farmersboy