 Carl Reiner (qv) and the other writers were very careful not to  use any 1960s slang in the shows scripts. In fact, references to  any time period or current events are very few and far between. Even  the Beatles are never mentioned despite the fact that Beatlemania  was at its peak while the show was in production. As a result, the  show has not become dated over time and the episodes are still as  fresh as they were when they were first aired.