Why do many people in Maycomb look down on Dolphus Raymond?

Who enters the courtroom to give Atticus a note at the end of Chapter 20?

Before the jury's verdict is given, Jem believes Atticus will ________ the Tom Robinson case.

At the end of the trial, the jury finds Tom Robinson ______________.

Dolphus Raymond carries with him a bottle inside a paper bag. What is ACTUALLY in this bottle?

The jury finishes deliberating at the end of Chapter 21, and Scout can tell what the jury's verdict is before they even announce it. How can she tell?