Today Detective Riddle

A woman is sitting in her hotel room when she hears a knock on the door. She opens the door and sees a man that she has never seen before. The man said, “I’m sorry, I have made a mistake. I thought this was my room”. The man then walked down the corridor and went in the elevator. Using her detective skills, the woman was suspicious of the man and went back into her room and phoned security. What made the woman suspicious of the man?

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