The important fact about Ichabod Crane that comes to light in the passage is the last one - Ichabod was an unjust teacher who punished his students with prejudice.
He punished those he did not like or considered could take the blame or burden for somebody else. He chose wisely whom to punish.
The part of this sentence from The Autobiography which identifies it as an autobiography is the word I. An autobiography is an account that is personally written by the author him or herself. It always takes the first person or the "I" point of view.
Words can mean so much more than images.
