What thematically related insights do Scout and Dill receive outside the courtroom in To Kill a Mockingbird?

During the Tom Robinson trial, Dill becomes so distraught
that Scout has to escort him from the courtroom in tears. Outside they meet Dolphus
Raymond sipping from his bottle-in-a-bag. He offers Dill a sip, and Dill discovers Mr.
Raymond's secret: It is only Coca-Cola, not whiskey. Earlier, inside the courtroom, the
children have seen for themselves that Tom Robinson is not the terrible rapist that town
rumor has reported, but a humble, quiet man with a crippled arm who could not have
beaten Mayella. And now they realize that Dolphus is not the mentally unstable eccentric
the town believes, but a friendly, sincere man who is kind to children. They have
witnessed two examples of how people are not always what they
seem.