Continuity mistake: The film is supposed to take place in 1917, but several of the german soldiers our heroes encounter are armed with Bergman M18 sub-machineguns which didn't appear until a year later. To make things even worse all the guns comes with a magazine-type that didn't appear until the mid-thirties.
Continuity mistake: During one of the dog-fight scenes, the snow on the ground disappears and comes back several times.
Factual error: The aircraft are definitely post-WWI. Biggles is flying a De Havilland Tiger Moth, which appeared in 1930s. The German fighter is probably the PT-23 Stearman.
Other mistake: One of the taglines for this film was "Meet Jim Ferguson. He lived a daring double-life with one foot in the 20th century and the other in World War I." World War One was fought in the 20th century.
Answer: It would be virtually impossible for a novice pilot to be able to do this.
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