Side note of some small things to point out:
In the podcast, I think they refer to Cunningham as "someone who doesn't like to be thanked." Just to clarify, he doesn't like to be thanked because he's poor and is paying off a debt to Atticus that he doesn't have the money for (so he has to pay in goods he's growing). And being thanked for that payment effectively reminds him of this fact. Lots of the movie is about Scout being given social hints about how it hurts the pride of poor people and to be considerate of them (they point this out in the podcast better with the syrup scene).
Another observation - Atticus struggling to shoot the gun with his glasses on. Seemed like a clear metaphor about how Atticus doesn't want to engage in violence, he wants to stick to the rational, but in the end, to take care of the rabid dog, he ultimately has to remove his glasses in order to kill it. The dog, I'll just assume is a metaphor for what happens with Ewell.