The company Walcott works for is named Darrow Ltd. as an homage to the novel "The Gates of Anubis".
Episode title: "Time of rascals"
Francesc Orella plays a man who flees to the time of the "Revolt of the Comuneros". Shortly after, he would play the role of Adrian of Utrecht in Charles, Emperor King (2015), the regent who would oversee the war on behalf of King Charles I.