At the end of the movie, when Tom Hanks' character is in the park interacting with Cristina Marsillach's character, he has his duffel bag with him and leaves the park with it on his way to the plane. When he arrives at the plane boards, he no longer has his duffel bag with him.
The single seat aircraft Tom Hanks lands in Egypt is a P51 Mustang. This was not used by the Desert Air Force as it was too new and needed for bomber support over Europe. It should have been a P40 Kittyhawk (US Tomahawk). It could have been a Spitfire late in 1942 perhaps.
An Austin A40 Devon saloon is briefly featured. It was not introduced until 1947.
In a number of scenes, Tom Hanks is dressed in a gray colored RAF uniform. The RAF uniform color is blue, and have never worn gray.
During the boxing match, it is very obvious that a lot of the extras who play fans are mouthing their words and not talking.
The MG car is an anachronism. It is a TD, built in the early 1950's. It should be a TA from the 1930's. All TDs had solid wheels and TAs had the large wire wheels.