The Doctor's psychic paper has as little effect upon Mary Shelley and Lord Byron as it did in The Shakespeare Code (2007) upon William Shakespeare.
Graham makes an homage to Jane Austen's "Pride and Prejudice" when first meeting Mary Shelley and Lord Byron, saying "it is a truth universally acknowledged" before he is interrupted. The rest of the quote is "it is a truth universally acknowledged that a single man in possession of a good fortune, must be in want of a wife." "Pride and Prejudice" had been published only three years before, in 1813.
Mary and Byron discuss the 13th Doctor's accent, and Polidori suggests that she's from The North (of England). In Rose (2005), Rose Tyler asked the 9th Doctor how he could be an alien, when he sounds like he's from The North, only to learn that "Lots of planets have a North."
This episode takes place in June 1816.