Bel and Freddie often call each other Moneypenny and James, in reference to iconic characters from the James Bond franchise. Ben Whishaw later joined that franchise as Q in Skyfall (2012).
This series contains 4 Game of Thrones (2011) cast members. These (and their respective characters) include Anton Lesser (Qyburn), Hannah John-Kamen (Ornela), Burn Gorman (Karl Tanner) and Oona Chaplin (Talisa Maegyr).