Tom Bower who plays Rex Barker in this episode was later cast as Mary Ellen's husband Dr Curtis Willard.
The first female wing walker was Lillian Boyer January 15, 1901 to February 1, 1989 was an American wing walker who performed numerous aerial stunts that included wing walking, automobile-to-airplane transfers, and parachute jumps between 1921 and 1929.
This is the first time we are introduced to Tom Bower who is playing Rex Barker, the airplane pilot. He is then brought back as a new character, in the future episode, The Engagement 5.7, where he plays Dr. Curtis Willard, and he marries Mary Ellen.