Many of the crew in Sherlock (2010) are related. Sherlock's parents are actually actor Benedict Cumberbatch's parents, Wanda Ventham and Timothy Carlton; Amanda Abbington (Mary Morstan) and Martin Freeman (John Watson) were real-life partners; producer Sue Vertue is writer Steven Moffat's wife, and co-producer and writer Beryl Vertue is his mother-in-law; writer Mark Gatiss' husband is the barrister in Sherlock: The Reichenbach Fall (2012); Steven Moffat's son plays Sherlock Holmes as a child in a few episodes.
In the American (PBS Masterpiece Mystery) broadcasts of this series, certain letters in the closing titles are highlighted red. These letters spell out a word that somehow relates to the episode. These highlighted letters don't occur in the closing credits of the original airings of the series (on BBC) though.
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We asked Doctors Jo Wilson, April Kepner, and Andrew DeLuca to tell us the episodes of the show that they think are the most essential to understanding their characters.