Cheers

Ted Danson, Rhea Perlman and George Wendt are the only actors to appear in every episode.

From the start of the series, writers and producers made it a point to never show anyone leaving the bar drunk to drive home.

After Ted Danson announced that he was leaving the series, NBC wanted to continue the series by having Woody take over the bar. But Woody Harrelson refused to continue with the series without Danson.