Miss Maudie tells why Atticus thinks it is sin to kill a mockingbird. Mockingbirds don't do anything wrong and they are innocent and only sing.
The knothole is the only method for Boo to contact the world in an attempt to make friends. Scout finds gum first, then later her and Jem find Indian coins.
Scout shows her child innocence when she disbands the mob in front of the jail. She is looking for a familiar face and she sees Mr. Cunningham. She asks him about his debt brings everyone back and the mob leaves.