It is revealed in this episode that Al's third wife, Ruthie, divorced him because he sang in his sleep.
Al: We did it, Sam! We did it! Of course it took enough power to light up St. Louis for a month but we did it!
Al: Sam! Get up and hit this pimple!…Sam, do something!...That’ll work.
Nancy Hudson: You lie to me I’ll drop your butt so fast you won't know what hit you.
(Al's cigar nearly falls out of his mouth)