Continuity mistake: During the flashback to the murder, watch closely right after Mary Debenham stabs Mr. Ratchett. One moment she is in the room, the next she is back in the doorway.
They all did it. All twelve people had a special relationship with the murdered child and acted as they felt the jury in the man's trial should have, finding him guilty of the murder of the little girl. They arranged the murder so that they all stabbed the body of the criminal at different times in the night so nobody would know who was technically the guilty one. Poirot then decides to present a false scenario to the officials, and the people on the train are allowed to leave.
Mrs. Hubbard: Don't you agree the man must have entered my compartment to gain access to Mr. Ratchett?
Princess Dragomiroff: I can think of no other reason, madame.
Question: Who was the person Poirot saw wearing the white dressing gown? And why did this person place it in his compartment? To plant "red herrings" like these do not draw attention away from the people on the train, but tells Poirot plain and simple that the murderer did NOT leave the train, but it still on board. So why bother doing it at all, as it only goes against their carefully planned cover story?
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