Factual error: Why is Hilts not wearing a uniform? A serving officer captured behind enemy lines in civilian clothing risked being shot as a spy. If a prisoner's uniform was too worn or damaged to wear, it was routine for the German authorities to replace it - a P.O.W. in civilian clothes is an obvious escape risk. He is wearing a pair of tan chinos, a cut off sloppy Joe sweatshirt, both ridiculously anachronistic - Sixties hipster fashions - and nowhere even close to a World War 2 uniform. He is also wearing Army Type III Service boots - something that would never have been issued to a fighter pilot.
Factual error: Throughout the film, sea grape vines are seen all along the shore. Sea grapes do not grow in the Pacific, where the story takes place, only in the Caribbean where the film was made.
Factual error: When the fleet of Glamcab Ford Cortinas drive out of their yard on the first day of business, some of the Cortinas are two door models, which wouldn't be legal for use as a taxi.
Factual error: In the scene where James Bond is being given his "gadgets", Q points out that his rifle is an "AR-7 in .25 caliber". The AR-7 is a real rifle, but is only available in .22 Long Rifle caliber. Due to numerous design features, especially the screw-off barrel, it can't be made to fire a .25 caliber cartridge of any type. (00:22:05)
Factual error: When Merlin and Arthur are squirrels Merlin says squirrels mate for life, which is not true. Squirrels are promiscuous.