Often considered a much happier companion piece to the season 4 finale two-parter "I'll be Waving as you Drive Away" where Mary loses her sight. In this episode, however, Mary begins having trouble seeing, and the issue is perfectly resolved with new glasses. In fact, Mary is able to see the world much clearer, reveling in the beauty of nature in a way she was unable to ever do before.
A boyfriend for Mrs. Beadle is introduced and is even caught kissing by Mary. However this is grossly inappropriate, because teachers at this time were forbidden to have boyfriends. She could have been seriously sanctioned or fired.