Actor Laurence Fox gets to act with his father James Fox, who is playing Professor Norman Deering.
The title of the episode is from "The Allegory of Love: A Study in Medieval Tradition", a book by C.S. Lewis. It is an influential exploration of the allegorical treatment of love in the Middle Ages and the Renaissance.
The line "The heart can and should obey the head" is credited to C. S. Lewis. It's a shortened version of a sentence in his book "The Abolition of Man". The exact quote is "The heart never takes the place of the head: but it can, and should, obey it."
Katia Winter and Tom Mison would later go on to co-star as husband and wife in Sleepy Hollow (2013).
Lewis Carroll is mentioned often in this episode. Dorian's fiancée is called Alice, after Carroll's most famous character. Also in the episode, Alice states that in the photo of herself & Dorian she was, "Grinning like a Cheshire cat", a reference to one of the charecters in, Alice's Adventures in Wonderland.