Also when she says at the beginning of the book no one is here but at the end she says oh yes, the two other men are upstairs. You think something is going to happen to him because the other men have been there for over 2 years so he might be with them too.
The landlady tells Billy that every character and guest signs the guest book. When Billy goes downstairs to sign the book, he notices that the there were only two guests checked in. The two guests checked in a long time ago. Every time she spoke about them, she was usually past tense, meanwhile she told Billy that they were still there.