Chapter 28 is pretty action-packed, so there isn't too much time for reflection, but there are some reminders of previous events. First, as Scout and Jem walk to the school for the pageant, they pass the Radley yard. As they do, they comment, "Boo must not be at home. Listen." They pause and listen, pondering Boo, which is one of their favorite pastimes. This is reminiscent of the earlier chapters, when they were fascinated with Boo, constantly wondering about him, and playing games of daring in regards to him and his house. As they listen, they hear a mockingbird in the tree; this reminds us of Tom Robinson and his death, since the mockingbird was symbolic of Tom and his innocence, and how his death was such a travesty (like the death of a mockingbird would be). So, we can reflect on Tom a bit through that reference. When Cecil Jacobs scares them, it reminds us of how Scout almost beat him up earlier in the novel for making fun of her dad for defending Tom. As Judge Taylor laughs at Scout's tardy entrance onto the stage, this also reminds us of the trial, because he was the presiding judge.
Then, when we find out that it was Bob Ewell that attacked them, it reminds us of all of the threats that he made against Atticus and his family; it is brought front-and-center, because he had made good on the threats. Then, as we wonder who saved Jem and Scout, we can't help but remember the gifts in the tree, the blanket around Scout at the fire, the sewn-up pants on the fence, and the laughter coming from the Radley household.
All of these little things serve as reminders of many things that have happened in the story to this point. They all merge into one action-packed and very dramatic chapter, that will have lasting impacts on the kids.