Dorian Newberry has a copy of "Slaughterhouse 5" by Kurt Vonnegut in his pocket. In Vonnegut's short story "Harrison Bergeron", the plot involves mind control in the form of head bands to obtain equality.
Right after the altercation in the English classroom, we see a shot of the chalkboard, and the teacher has misspelled the word "tomorrow," using two "m"s instead of one.