Jem and Scout find pennies, gum, ball of twine, spelling bee medal, and even carved soap sculptures of a boy and a girl. This moment was a moment symbolism of friendship between Boo Radley and the kids. Boo Radley actually wasn't actually all bad. This shows a different perspective from Boo on how he feels about the kids.
Calpurnia calls Jem "Mister" now because he is getting older. He is also not as childish and is starting to tell scout to be more like a girl even though he didn't want her to be like one. Calpurnia also shows a sign of southern respect for Jem. This teaches Jem moral education and is also a big theme in the book