Trivia Facts | Top Quotes | Goofs/Mistakes
  • Matt Smith auditioned for the role of Doctor Watson before his Doctor Who audition.
  • The actual address used for filming the exteriors of 221B Baker Street is 187 North Gower Street, London NW1.
  • As in the Sir Arthur Conan Doyle stories, the term "deduction" is misused. Like medical diagnosticians, hunters and yes, detectives, what Holmes actually uses is neither deduction nor induction, but a third form of inference called "abductive reasoning".
  • In the original stories, Dr. Watson has also done military service in Afghanistan.
  • In this series, Watson was wounded in the shoulder but has psychosomatic/psychogenic pain in his leg. This is a sly reference to the original stories in which Arthur Conan Doyle was inconsistent about the location of Watson's war wound.
  • The typeface used in the overlays is Johnston Sans, well-known for its use in the London Underground.
  • Benedict Cumberbatch was cast after Steven Moffat and Mark Gatiss watched his performance in Atonement. They thought he looked like a perfect Holmes.
  • During the hiatus between the first and second series, Martin Freeman and Benedict Cumberbatch were both cast in Peter Jackson's films The Hobbit: An Unexpected Journey (2012), The Hobbit: The Desolation of Smaug (2013) and The Hobbit: There and Back Again (2014). This time Freeman took the lead as Bilbo, and Cumberbatch provided the motion-capture and voice for Smaug the Dragon and The Necromancer.
  • As part of his preparation after being cast as Holmes, Benedict Cumberbatch read every original Conan Doyle story.
  • In the summer of 2011 Danny Boyle created a National Theatre production of 'Frankenstein' in which Benedict Cumberbatch and Jonny Lee Miller played the creator and monster and alternately changed nightly. Both actors then went on to play another Victorian creation Sherlock Holmes, both set in the present day, allbeit opposite side of the Atlantic.
  • Sherlock sometimes uses a memory technique that he calls a "Mind Palace." This is not an invention of the screenwriters; rather, it is a method of aiding memory that dates back to ancient Rome. One of history's most famous real-life practitioners was the sixteenth-century Italian Jesuit missionary Matteo Ricci, who introduced the method to China.
  • The house portrayed as 221B Baker Street is actually 187 North Gower Street; the real 221B Baker Street now houses the Sherlock Holmes Museum.
  • Unlike the book, here Moriarty is known to the criminals on the street. In the book, everyone knows the fellow only as a highly reputed mathematics professor, until he commits a mistake - hangs a masterpiece painting which would have otherwise been unaffordable to him, in his study, which is spotted by Sherlock Holmes.
  • Sherlock tells Watson to text a message to a specific number. The text requests a meeting at 22 Northumberland Street. Sherlock and Watson set up a viewing position across from the address to see who shows up. The camera never really shows what is at that address, only the road in front where the cab pulls up. That address happens to be the Sherlock Holmes Pub, which has been there for many years. Another interesting thing about the address is that is used to be the Northumberland Hotel, the hotel which featured in 'The Hound of the Baskervilles' when Sir Henry Baskerville came to stay in London before going out to Baskerville Hall.
  • Stanley Townsend replaced Joseph Long who played Angelo in the unaired pilot.
  • The plot of A Study in Pink is largely based off the first Sherlock Holmes novel, A Study in Scarlet, with some changes and allowances for modern times. Most notably is the word 'Rache': in A Study in Scarlet, Holmes suggests the victim was trying to write the name Rachel, later realizing that he (the book's victim was a man) wrote the German word 'rache', meaning revenge, as a clue. In A Study in Pink, it is reversed - Anderson notes the word 'Rache' means revenge in German, but Holmes deduces she was trying to write the name Rachel.
  • In this episode, Seb Wilkes (played by Bertie Carvel) notes that he and Sherlock Holmes had been "in uni together". Benedict Cumberbatch and Carvel played college friends in the TV drama Hawking (2004) (TV).
  • The concept of the coded cypher comes from the Sherlock Holmes novel "The Valley of Fear," but the plot, though it slightly resembles that novel's, also bears similarities to other Holmes stories, including "The Sign of Four."
  • Early in this episode, in the first crime scene, a book by Dan Brown (VI) is clearly in Van Coon's apartment, "The Lost Symbol". Like in many of Brown's books - and especially this one - he deals with codes. This episode's main clue to find the killer are the codes he leaves in the crime scenes.
  • Amanda, the secretary, is played by Olivia Poulet, who was in a 12 year relationship with Benedict Cumberbatch (Sherlock) at the time of filming.
  • The plot of this episode was inspired by the Holmes short story, "The Adventure of the Bruce-Partington Plans."
  • The music used in the Planetarium presentation on Jupiter is from The Planets suite by Gustav Holst, but it is the second movement ("Mars, the Bringer of War"), not the fifth ("Jupiter, the Bringer of Jollity").
  • The title of Watson's blog entries "The speckled blonde" is based on the original Holmes story "The Adventure of the Speckled Band" (published in 1892), "The Geek Interpreter" is based on the story "The Greek Interpreter" (published in 1894) and "The Six Thatchers" is based on the story "The Adventure of the Six Napoleons" (published in 1905).
  • The plot of this story, as well as the character of Irene Adler, come from the Arthur Conan Doyle story "A Scandal in Bohemia."
  • Watson tells Sherlock and Irene his middle name is Hamish. Watson is called John H. Watson in the stories except for a couple of times when he is called James. This puzzled scholars for years until Dorothy L. Sayers suggested the H stood for Hamish, the Scottish version of James.
  • Moriarty's ringtone is Stayin' Alive by The Bee Gees.
  • On the wall in Baker Street while Mycroft is visiting, Holmes has a copy of the board from the children's game "Clue".
  • Belgravia, in Central London, is one of the wealthiest districts in the world. Buckingham Palace is nearby.
  • The episode begins with the resolution of the swimming pool scene that ended the previous episode "Sherlock" (2010) {The Great Game (#1.3)}. The new scene was shot 18 months after the earlier part of the scene (as the writers were not then sure what they would want to do yet). If you look closely, you might detect Sherlock's face is a bit fuller and Watson is wearing a wig.
  • Producer Sue Vertue was at a funeral when someone's cellphone went off. It was, most inappropriately, playing 'Staying Alive'. When her husband, Steven Moffat, heard this he decided it was the perfect ringtone for Moriarty.