The title is from the play "A Moon for the Misbegotten" by Eugene O'Neill. Ed Flanders from the cast of "St. Elsewhere" won a 1973 Tony during a revival of the play. The original production opened at the Bijou Theater in New York on May 2, 1957 and ran for 68 performances. Th3 1973 production opened at the Morosco Theater on December 29, 1973 and ran for 313 performances winning six Tonies.
This show almost didn't get on the air - no, not because of Westphal mooning Gideon (censor Ralph Daniels decided to let it go by because Ed Flanders' bare bottom was "not erotic") - but because the fictional Ecumenica Corporation which now owned the hospital sounded much too much like the real-life Humana Corporation. During the closing credits, NBC actually put up a full-screen disclaimer over part of the titles stating that Ecumenica WAS fictitious.