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Lateral Thinking #25- Suspicious Behaviour -

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Puzzle Image
A woman is resting in her hotel room when there is a knock on the door. She opens the door and sees a man she has never seen before. He apologizes and says "I'm sorry, I thought this was my room".

The man then heads down the hall and into the elevator. The woman goes back into her room and calls security. What made the woman suspicious of wrongdoing?
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?