This scene shows when the narrator was in service to the old man. The old man was nice to him and had never done anything wrong to the narrator, but his eye made him want to kill the old man. The mans eye was pale blue and filmy This is what the entire story is about and that's why this scene is important. "I loved the old man. He had never given me insult. For his gold I had no desire. I think it was his eye! Yes, it was this!"
This is when he killed the old man and later dismembered and hid the body. He had watched the man sleep for several nights beforehand and finally took action on the 8th night. This is the climax of the story which is why it's important. "The old man was dead. I removed the bed and examined the corpse. Yes he was stone, stone dead."
This was the resolution of the story. A neighbor had heard a shriek so they called the police who came to investigate. By then, he had hid the body and got rid of any evidence, so he was confident. He got confident enough to offer the policemen to rest in the room that he had killed the old man in and hid the body. He then thinks he hears the mans heartbeat and admits to the crime. "I admit the deed! tear up the planks! here,here!"