The song Lynda Carter sings at the beginning, "The Last Song", she also sings in her second variety show, Lynda Carter Encore! (1980).
The introductory setting is stated to be Landry, Texas. Though there is no actual Landry, Texas, at the time, Tom Landry was the head coach of the NFL's Dallas Cowboys and had been since 1960. He is enshrined in the Pro Football Hall of Fame and is considered one of the greatest head coaches of all time.