In O BROTHER WHERE ART THOU?, set in the 1930s, George Clooney says "look at Delmar as your paradigm of hope". Nobody used the word "paradigm" as mental model until Thomas Kuhn's THE STRUCTURE OF SCIENTIFIC REVOLUTIONS (1962).
Prompts a fun question: whats the most niche historical inaccuracy in a piece of work that annoys you
Not like 'oh they were referring to the wrong king' , more 'they had the wrong king on a banknote in one scene'