By the time of her whirlwind tour to America in 1965, Princess Margaret (Helena Bonham Carter) had already met Lyndon B. Johnson (Clancy Brown) when she represented the Crown at independence ceremonies in Jamaica in 1962 and he, as vice president, represented the U.S.. At the November 17 dinner-dance, Kirk Douglas and Henry Ford II were also among the celebrity guests at Margaret's table.
Princess Margarets tour of the US wasn't quite so successful in reality and the press was actually bad as she had a habit of insulting people the more she drank
The episode implies that Elizabeth was made heir apparent to her father. In fact, this isn't true. Elizabeth remained heir presumptive throughout her father's reign. Though Elizabeth was prepared for the likelihood she would succeed her father, she was still not the heir apparent. The English heir apparent is given the title of Prince of Wales. Though not every heir has been granted the title, there was no reason not to give it to Elizabeth. Her situation mirrors that of Victoria. At the time of both of their births, the likelihood they would succeed to the throne was nominal. The men that were in front of them in the line, could have had a son and thus displace them. For this reason, neither Victoria nor Elizabeth were made Princess of Wales.
The scenes located in The Beverly Hills Hotel in Los Angeles are actually filmed in Seville (Spain) in the Alfonso XIII Hotel.
The 1964 Cadillac limousine wore lettered tires. They always featured whitewalls.