Trivia: The 2018 novelization, also written by Russell T Davies, expands the scene where conspiracy theorist Clive shows Rose pictures of the Doctor in multiple time periods. In the episode, he only shows her pictures of Nine, but in the book, he has pictures of every incarnation of the Doctor up to Thirteen, as well as pictures of two incarnations from even further in the future. The two potential future incarnations are described as a "tall, bald black woman wielding a flaming sword" and a "girl or boy in a high-tech wheelchair accompanied by what appeared to be a robot dog". Conveniently, Rose happens to turn away just as Clive shows a picture of the Tenth Doctor, since she can't see him before the regeneration in "The Parting of the Ways". On a final, amusing note, the picture of Thirteen shows her being chased by a giant frog outside Buckingham Palace.