-The story was told 50 years after it happened
-Montressor talks about the 'thousand injuries' inflicted by Fortunado but never elaborates. Also, when they meet, Fortunado is courteous and polite
-Montressor is evil (he talks about Fortunado's 'weak point') and would not hesitate to kill a man. Also, as he is luring Fortunado into his death, he talks ironically.
I need to write one more point. Please, someone help me.