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Factual error: Poirot refers to the senior police officer in Jerusalem as the Chief Inspector of Police and implies that he commands the police in Jerusalem. The Palestine Police had no rank of Chief Inspector. The three stars worn by the officer were the insignia of an Assistant Superintendent of Police, the entry-level rank for gazetted officers. The head of the Jerusalem police was a District Superintendent of Police, two ranks higher. As Poirot is famously a stickler for detail, it's certainly not a character mistake.

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Factual error: Both the Yugoslav police officers Poirot is speaking to at the end are black. The chances of a black person serving in the Yugoslav police in the 1930s were zero.

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Factual error: Brod railway station is not (and never was) an isolated railway station with mountains behind it. No mountains are visible from it but the town and fortress are nearby and easily visible from the station.

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Factual error: The chefs on the Orient Express in the movie are female. Women did not work as chefs in the 1930s and none of the train crew would have been female in any case.

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Factual error: The Orient Express had a restaurant coach, four sleeping coaches and two baggage cars, and carried 58 passengers, far larger than the train depicted. There was a conductor always on duty in every sleeping coach and they worked shifts, so more than four would be carried; it's stated that Michel is the only conductor on board.

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