A good question, and a tough one to answer. It is hard to answer because as mature as Scout is, she's really not paying attention to things like town growth in some abstract sense. All we have to go on as evidence for change and growth are the things that bump up against her own story.
Here are some changes that Scout explicitly mentions (she says that after the trial, there were only two):
People took down their stickers that had read "NRA-WE DO OUR PART." This was because the National Recovery Act had ended.
The second change Scout sees is in how organized Halloween becomes after the Barber sisters were robbed.
However, we can see Maycomb struggling to grow in Atticus' defense of Tom, and how the townspeople talked and wrote about it (and didn't). Even the respect the town pays Atticus is an attempt to change.