April 1st, 1978

the show's final episode, "Happy Trails to You", Bob gives up his psychology practice and accepts a teaching position at a small college in Oregon, with the Hartleys leaving Chicago—as well as their friends and neighbors, and Bob's patients—behind them. The closing scene, in which the cast exchange tearful goodbyes and embrace before bursting into an impromptu refrain of "Oklahoma", is a wry nod to the Mary Tyler Moore Show finale (also produced by MTM) from the previous year.

http://weblogs.variety.com/photos/uncategorized/2008/01/20/newhartcastphotocreditmtmenterprise.jpg

Then Bob Hartley went on to have an 8-year dream where he was married to a beautiful blond woman, ran an inn in Vermont with these three crazy brothers...;) :cool: :D