Facts conveyed by the episode: Titanium dioxide is pigment used to make ink. Oversleeping is a sign of malnutrition Sherlock Holmes is the greatest detective in the history of fiction. It was his dedication. He examined every fragment of his city, investigated not only the world around him, but the history beneath. He dug deeper, altered his perspective, scrutinized every detail. He studied every book, every map, every pigeon in London for fun. Potassium nitrate, or saltpetre, old-fashioned accelerant used in gunpowder Fabry disease, It's a rare enzyme deficiency in the kidneys treated with an even rarer medication called Galafold (Migalastat), traces of which can be found in the hair. Ladies Mile, now known as the Flatiron district, It was filled with clothing stores for the carriage crowd. In 1896, the Siegel-Cooper building becomes the first steel-framed department store in the city largest in the world.
The original title was simply "Lincoln".
With 4.37 million viewers, this was the most watched episode of the series.