(At around 9 minutes, 30 seconds) There are two shots of the Lockheed Hudson carrying Drake and Fenton to France, one of the airplane in flight, and one of the airplane landing. Between those two shots is a close-up of one of the wheels being lowered for landing. The close-up shows a wheel supported by two struts--but the shot of the Hudson landing clearly shows that each main wheel has only one strut.
At some points, it is stated that bacteriological warfare is being researched. At other points it is stated that viral warfare is being researched. Bacteria and viruses are two different organisms, yet the characters act as if they are the same thing.