Accidentally Accurate: At the beginning of Season Three, Lady Marjorie is written off the series by having her go down with the Titanic—even though women in first class had the second-highest survival rate of any group on board. The highest survival rate? First-class women's servants—like Roberts, who shows up later in the season to confirm Lady Marjorie’s death.
Crowning Moment of Awesome: "Guest of Honour", where King Edward VII comes to dinner at Eaton Place, a huge honour for the Bellamy family AND staff ... while, upstairs, former housemaid Sarah gives birth to her first child, fathered by James Bellamy, the son of the house.
Ear Worm: The theme tune. Used on the radio 4 PM show with a section called 'Up Shares, Down Shares' and lead to a large series of remixes. Still possible to listen to here.
Growing the Beard: The first two seasons are much more light-hearted, and (with the exception of "Guest of Honour") much less popular with critics and viewers, than the third and fourth seasons.
Les Yay: Interpret Rose and Sarah's friendship as you will.
Acceptable Political Targets: Obviously, just about everyone is horrified when Spargo and Persie reveal themselves to be Fascists. Spargo ends up repenting, while Persie goes off to Nazi Germany and becomes a kept woman.
Neville Chamberland, full-stop, as a punching bag for forcing the country to appease Hitler.