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 (respecting the legal fiction that a male heir could have been born to take precedence over her). The English heir apparent is usually given the title of Prince of Wales and 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, in real terms, indisputable. The men that were in front of them in the line however, could have fathered a son and thus displace them. For this reason neither Victoria nor Elizabeth was made Princess of Wales in their own right.
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.