Tom Hollander previously played George V in The Lost Prince (2003). Additionally, here he also plays the British monarch's cousins Wilhelm II of Germany and Nicholas II of Russia. The physical resemblance between George and Nicholas has often been remarked upon.
Cast members appearing in this movie who have also appeared in the James Bond film franchise include Gemma Arterton, who was the Bond Girl Strawberry Fields in Quantum of Solace (2008), Charles Dance, who was the henchman Claus in For Your Eyes Only (1981), and Ralph Fiennes, who played M/Mallory in Skyfall (2012), Spectre (2015), and No Time to Die (2020). Also, Dance played Ian Fleming in the television movie Goldeneye (1989).