Were there incidents or observations in the book that seemed unusually "knowing" for such a young child?

One example that exhibits Scout's being "knowing" or aware as a young child is the way she reacts to the men at the jail. Rather than cry or add to the tension and danger that surrounded her father she kicks a man in defense of her father, after which she chose to directly address the one adult she knew, Mr. Cunningham..... something that made the adult uncomfortable. This feeling spread to the other men, and the group dispersed.