This is from the scene when Miss Caroline got furious with Scout for being literate This shows how back then you were expected not to know much. Because either you were an illiterate farmer or a rich person that went to private school. Scout was surprised because she didn't know it was a bad thing to know how to read.
"If he didn't teach you who did"
This is the scene when Jem cuts Scout off in the schoolyard and asking how her first day is going. She says she hates Miss Caroline and he tells her about the Dewey Decimal System. This shows how school was still changing and still developing its ways.
"I'm just trying to tell you there is a new way they are techin' the first grade, stubborn. It's the Dewey Decimal System."
This scene is when Miss Caroline it Scout on the first and made her sit in the corner until noon. This would never fly in school systems now because some parents would become furious with a teacher if they even yelled at their kid.
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This is from the scene when Miss Caroline asks if anyone is going home for lunch. This never happens now days, except when you are a senior in high school, but especially not 1st grade
This is the scene when Miss Caroline sees a cootie in Little Chucks's hair. Most people now have better hygiene than they did back then because we know more about it.