What new things does Scout learn here about how the black people live?

She learns of many cultural differences between the black
community and white community.

Consider the events which
take Scout by surprise:

1.  EVERYONE gives at church - up
front and publically.  No private passing of the plate.
2.  Guests are not
expected to give (as per Calpurnia's direction to put their dimes away as she provides
them with money herself).
3.  Most cannot read.
4.  There is no
organ yet the music manages to move Scout.
5.  The sermon is so personalized,
individuals are called out by name.  Additionally, no one is offended by
this.
6.  It is very important to Calpurnia that the children are clean and
well dressed, as that is an immediate reflection on her.