Senan West, who plays Prince William, is Dominic West's real son. Dominic West plays Prince Charles.
When the Queen tells her grandson, Prince William, her television set "might even be rented", it is a reference to Season One, where the Queen (then played by Claire Foy ) witnesses the Queen Mother slamming the television and telling her: "Careful, Mummy. It is rented."
Haydn Gwynne, who plays Lady Susan Hussey in this episode, also played Camilla Duchess of Cornwall (now Queen Camilla) in the Channel 4 comedy The Windsors (2016). Her husband Marmaduke Hussey is portrayed by Richard Cordery in this same episode.
Actor Prasanna Puwanarajah who plays reporter Martin Bashir previously played the same role in the film Diana with Naomi Watts.