pedantic

marked by a narrow focus on or display of learning especially its trivial aspects

Of or pertaining to a pedant; characteristic of, or resembling, a pedant; ostentatious of learning; as, a pedantic writer; a pedantic description; a pedantical affectation.

from Latin 'pedagogicus', related to a teacher's petty concerns

“Proceeding at once to the comments of these high-class missionaries on the really curious inquisitiveness of certain of the foreign passengers on board, he introduced to them the indisputably learned, the very argumentative, crashing, arrogant, pedantic, dogmatic, philological German gentleman, Dr.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

Astrid, Mumbai's most pedantic librarian, refused to smile until a patron spelled "encyclopedia" correctly. One sunny day, a child walked in and asked for help finding the "Almanac." Astrid’s face lit up like Diwali fireworks, her strict demeanor melting into pure joy.

At the edge of Casablanca's bustling Habous district, Bartholomew pointed out a tiny spelling error on a sign outside an old bookstore. His pedantic finger hovered over the mistake, oblivious to the spices and textiles that filled the air around him.

“As an exercise in Scots baronial, it is sometimes described as too ordered, pedantic, and even Germanic as a consequence of Prince Albert's influence on the design.”