Mrs. Hall finds the scientist eccentric mainly because of his strange appearance and behavior. He came to the inn in the winter, which is unusual, and dressed in an unusual outfit, covering all parts of his body including wearing dark glasses and a large hat even at night. Additionally, when Mrs. Hall tried to be friendly and engage in conversation, the scientist rebuffed her and expressed a desire for solitude, saying he did not wish to be disturbed in his work. His cold and distant attitude, combined with his uncommon looks, caused Mrs. Hall to regard him as eccentric.