That’s not the finale
“Goodbye, Farewell and Amen” which was the series finale, in fact was not the last episode filmed. “As Time Goes By” was the final episode filmed, where they took the time to honor and pay tribute to the characters who left the show before its conclusion.

Thats Not The Finale
That’s my wife
Colonel Sherman T. Potter had a photo of his wife, Mildred on his desk, but that photo was actually a picture of Harry Morgan’s then wife Eileen Detchon. How sweet!

Thats My Wife