A man reads a newspaper bearing the headline "Queen's Critic at it Again." At the right-most portion of The People daily, another story is titled "Diana Found Dead," a foreboding reference to the tragic accident decades later.
"Victor Gabon" or "Baboon", Princess Margaret's (Vanessa Kirby ) new hair stylist, was actually cutting-edge British hairdresser Vidal Sassoon, CBE. He opened his first salon in 1954 in London, and modernized women's hair styles. Sassoon created Mia Farrow's unique pixie cut for her role in Rosemary's Baby (1968).
The scene in which the train is taking the queen back, is the same train and track as the Hogwarts Express from Harry Potter.
Filming for Balmoral Estate actually took place at Ardverikie Estate, near Loch Laggan.
Filming took place at Adverikie House, in Scotland, also. This is the same location where the series Monarch of the Glen (2000) was filmed.