"What I Did" includes several elements that are reused in "Blink", including messages under the wallpaper and an ontological paradox involving a conversation between Sally and the Doctor, prerecorded on a video cassette, based on a written transcript—the essay itself; however, instead of the Weeping Angels, "What I Did" features the Doctor and the TARDIS inadvertently separated twenty years in time by a fault in the time machine, and the Doctor is able to instruct Sally how to bring it back to him in the past.