Prince Edward is shown wearing the uniform of a Royal Marines officer. In fact, Edward dropped out of Royal Marines training partway through, and never served in the military.
Even though Michael Sinclair MacAuslan Shea (Nicholas Farrell) was at the center of the "mole hunt" in 1986 for the person who gave a briefing to a journalist on The Sunday Times, the Queen's Private Secretary asserted in writing that Shea's comments had been misreported. Shea would only leave his royal service the following year, denying any connection with the earlier controversy. He published 20 books, most of them political thrillers.
The first time HMY Britannia is shown, the wrong Union Jack is flying from the jack staff. The flag flown was the flag of the Kingdom of Great Britain (1707-1800) which differs since it does not have St. Patrick's cross which is shown on the flag of the United Kingdom.
A group of Sikh soldiers is seen listening to Elizabeth's 1948 speech, with cactus in the background. Cactus does not grow in South Asia.