English has changed in the 23 years since that episode.
Even if grammar is set in stone, pronunciation changes over time. Idiomatic expressions come into being, or go into disuse. A word can be born, make its way into general usage, fall out of favor, and die in the course of a few decades.
It's true the highest registers of a language change more slowly than informal language, but they do change. I wouldn't expect a language with as many speakers as English or French to be stagnant for four centuries.