In a few scenes extras are seen in clothing styles decades ahead of the 1930s setting in which the movie take place.
On a few occasions (e.g., at 1:24:08), there are British officers with long sideburns and beards, which were not permitted at that time.
Only one model of airplane is used to represent every Japanese plane seen in the movie: post-war De Havilland Beaver planes (fitted with wheels).