Factual error: One of the scenes shows the buildup of American readiness as tensions mount. A B-52 bomber appears carrying four white menacing-looking missiles under her wings. Such missiles can easily be identified as the Hound Dog type, which was under test in the mid-60s but never became operational. America would never deploy those missiles either for real or for training, because the project was scrapped before even being accepted into the Air Force.
Factual error: In the scene when Zhen is writing down the characters of Shu Lian's name, she writes the modern form of the "Lian". That form wasn't introduced into the language until after World War II, and this movie is set well before the fall of Imperial China.
Factual error: One of the cars featured at the end of the film is an Alvis TA21, which only entered production in 1950, several years after the Nuremberg Trials.