An anachronism: Poirot is drinking a glass of green beverage and can see a modern-designed car on the road outside the window.
Geographical error: When the passengers are on the train, they can hear passengers speaking different languages from all directions, they will go to the same destination: Fia, Belgrade, Zagreb, Browd, Driasti. Among them, Browder was mentioned after Zagreb and Deriasti before, as if it was located between the two cities. In fact, it should be located between Belgrade and Zagreb.
Anachronism: In Istanbul, the audience can hear a person reporting prayer moments doing the standard prayers of Muhammad believers. He said in Arabic "Allahu Akbar! Allahu Akbar!" It is illegal for Arabs to pray. As a Turk, he can only say "Tanri Uludur!" is appropriate. This law was not repealed until the death of the ruling ruler Kemal Atatürk in 1938.
Coherence: When the flight attendant's uniform was found in the box, the position of the hat changed from shot to shot
.
