The more I think about it, this Series might be the most solid without any weak link episodes at all. I have gotten to appreciate Mending Stuart's Leg more over time and of course, Man From Oswestry is a classic.
This marks the final appearance of librarian Mr. Wainwright (Blake Butler) and his assistant, Miss Moody (Kate Brown). Wainwright throws the trio out of the library one last time. Miss Moody is clearly more literate than her boss, as she quotes The Wasteland (1922) by the poet T.S. Eliot (1888-1965). Wainwright not only doesn’t know The Wasteland, he doesn’t even know who T.S. Eliot was!
These days, Eliot is probably best known for his connection to the Andrew Lloyd Webber musical Cats (1981), which is based on Eliot's Old Possum's Book of Practical Cats (1939).
A bit of trivia in the context of this thread: the Hogarth Press (owned by Leonard and Virginia Woolf) published the first UK edition of The Wasteland, but when Eliot brought them Old Possum's Book of Practical Cats, they thought he had lost his mind!