It was Bob Newhart's idea to begin using film from season two onward in order to give the show a more realistic look.
Larry (William Sanderson), Darryl (Tony Papenfuss) and Darryl (John Voldstad) were supposed to be one-time characters, but the studio audience's reaction to their introduction was so spontaneous the producers decided to make them regular characters..
During the show's entire eight year run, the name of the town or community where The Vermont Inn was located was never mentioned, although some believe it may have been Norwich.
Exterior scenes of the Stratford Inn were those of the Waybury Inn in Vermont.
The opening credits are outtakes of On Golden Pond (1981). If you look closely, you can see Henry Fonda and Katharine Hepburn in the car. William Lanteau, who was the recurring role of Chester in the series, was also in On Golden Pond (1981).