"Mad Men" was so meticulous about its period-appropriate decor, but they used an edition of the Compact Oxford English Dictionary from 1987 in an episode set in 1963. www.visualthesaurus.com/cm/wordroute...
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'