Jervis Tetch, the Mad Hatter, refers to Alice once in the episode by saying, "Good evening, Miss Pleasance." This is a reference to Alice Pleasance Lidell, a likely inspiration for the character Alice in Alice's Adventures in Wonderland, which is the inspiration for the Mad Hatter and Alice Pleasance.
Roddy McDowall portrays the voice of Mad Hatter. McDowall previously played the live action villain role of The Bookworm in The Bookworm Turns (1966)/While Gotham City Burns (1966).
Mad Hatter gets pinned under a model of Jabberwocky at the end.