!!The Doyle Canon
* AdaptationOverdosed: Holmes might very well take the ultimate crown here. [[https://en.wikipedia.org/wiki/Adaptations_of_Sherlock_Holmes The Other Wiki]] says he is the most frequently-portrayed character in the history of cinema, having been played (by some counts) by over 75 different actors in 211 films. In a book on the subject, Holmes scholar Ronald B. [=DeWaal=] lists an astonishing '''25,000''' Holmes-related productions and products. Or just look at the [[Franchise/SherlockHolmes Franchise page]] for our list.
* BeamMeUpScotty:
** In the original novels, Holmes ''never'' actually uttered the exact phrase "Elementary, my dear Watson". He uses the phrase 'elementary' on occasion, and often refers to Watson as 'my dear Watson' but never combines the two. The phrase actually comes from a Creator/PGWodehouse novel.
** Nor did he ever cry, "Quick, Watson, the needle!" That phrase originates in Victor Herbert's comic operetta ''The Red Mill'', where it's used by a character who's ''impersonating'' Holmes.
** Likewise, the [[IconicOutfit deerstalker cap and Inverness coat]] are never mentioned in the stories proper, and while Sidney Paget did at times draw him wearing one or the other[[note]]a deerstalker in "Silver Blaze", an Inverness coat in "The Blue Carbuncle"[[/note]], he never put them both together. Nor would Holmes, despite his recurrent flakiness, have worn such a countrified outfit in the middle of London.
** Lampshaded in the recent ''VideoGame/SherlockHolmesVersusJackTheRipper'' game, in which at one point Sherlock asks Watson to "bring [him] that old deerstalker [he] never wear[s], but everyone seems convinced [he] wear[s] all the time".
** And [[PlayingWithATrope played with]] in the second season of ''Series/{{Sherlock}}'' BBC, where Sherlock [[spoiler:pulls on a deerstalker cap in an attempt to avoid paparazzi, and merely ends up with the press considering him the "man with the funny little hat" with pictures to back it up.]]
** Parodies of Sherlock Holmes stories often begin with "TheCaseOf...", but the titles of (most of) the original stories begin with "The Adventure Of..." instead. Only one story title ("A Case of Identity") even uses the word "case".
* {{Fandom}}: Before ''Series/StarTrekTheOriginalSeries'', before ''Series/DoctorWho'', before even Tolkien, there were people who would write letters, fan-fics, pastiches and overanalytical articles pertaining to Holmes and "The Game" using the LiteraryAgentHypothesis.
* MagnumOpusDissonance: Conan Doyle respected Holmes enough to avert [[DroppedABridgeOnHim dropping a bridge on him]] in "The Final Problem", feeling the character deserved to go out with a bang. He did, however, resent that the character was so large that nothing he, Doyle, ever wrote would ever be able to crawl out from under Holmes's shadow.
* MoneyDearBoy: One of the reasons Doyle eventually brought Holmes back was because of the enormous sums of money editors were offering him.
** It didn't help that even Sir Arthur Conan Doyle's ''mother'' [[AlmightyMom complained about Holmes being killed.]]
** Also, Holmes' primary motivation for becoming the King of Bohemia's henchman, in 'A Scandal In Bohemia.' God knows there wasn't a shred of honor in it.
* RecycledScript: "The Crooked Man" is essentially a rehash of ''The Sign of the Four'', albeit with a sympathetic suspect and [[spoiler: a mongoose's footprint instead of a cannibal's]].
* US President Franklin D. Roosevelt once made a [[WildMassGuessing WMG]] that [[http://books.google.com/books?id=9LGvL2WcXX0C&pg=PA404&lpg=PA404&dq=franklin+roosevelt+sherlock+holmes&source=bl&ots=fnk7VRLhg4&sig=cBzqBFUwBsmlxFgA6lhtEBrabCY&hl=en&sa=X&ei=lsEDT-eLOMWYiQKF1b2EDQ&ved=0CC0Q6AEwAg#v=onepage&q=franklin%20roosevelt%20sherlock%20holmes&f=false Sherlock Holmes was born an American]].
* ScienceMarchesOn:
** In "The Adventure of the Blue Carbuncle", Sherlock determines that a man is intelligent by his hat size, reasoning that a man with a big head has a large brain, and therefore is smarter than average. While there is some dispute among modern scientists as to whether there's any correlation brain size and intelligence, any correlation would be subtler and less pronounced than the one Holmes claims.
** BrainFever, which is not real, appears in several stories.
** In several stories Holmes attributes things like personality and interests to genetics.
** The science in "The Creeping Man" is flawed, to say the least, unless you consider the effects of the "potion" to be psychosomatic, and Professor Presbury a highly suggestible lunatic. The idea of using serums taken from animals for rejuvenation and invigoration was taken quite seriously by many scientists in the late 19th and early 20th centuries.
** The biology in "The Speckled Band" is also flawed. Snakes do not work that way.
* WordOfDante: Holmesian fanon (known amongst fans as The Game, since long before the existance of the internet) is varied and has many varied sources from many mediums. The three main sources, however, are William Stuart Baring-Gould's ''The annotated Sherlock Holmes'' and ''Literature/SherlockHolmesOfBakerStreet'', and Leslie Klinger's ''The New Annotated Sherlock Holmes''.
** Irene Adler is now frequently considered to be Holmes' LoveInterest thanks to this trope and PromotedToLoveInterest.
** Similarly, Mycroft Holmes and the Diogenes Club have been expanded by later pastiches (notably ''Film/ThePrivateLifeOfSherlockHolmes'') into the Head of the Secret Service and one of its fronts respectively, when in the original canon they're little more than what Doyle presents them as (a BrilliantButLazy civil servant and a club for reclusive eccentrics).

!!The 2009 film
* AbilityOverAppearance: Robert Downey Jr. being cast as Holmes despite looking completely different from his descriptions in the stories.
* AuthorAppeal: Holmes and Watson manage to subdue Dredger with an arm bar and rear-naked choke, as director Guy Ritchie is a fan of Brazilian Jiu-Jitsu.
* CastingGag: Geraldine James, who plays Mrs Hudson, had previously starred in an adaptation of ''Literature/TheHoundOfTheBaskervilles''.
* CreatorInJoke: A brief shot of an inn called 'The Punch Bowl' is visible. Guy Ritchie owns a pub called The Punch Bowl in Mayfair.
* CreditsGag: There are a couple, mostly in the juxtaposition of assorted credits with images from the film. The best of these is that the Costume Designer's credit appears with an image of the naked Holmes tied to a bed.
* DeletedScene: So, Irene never got around to trying to stab Holmes with a hair pin or kneeing him in the... meerschaum, eh?
* DyeingForYourArt: Downey did this movie in between the first two ''Film/IronMan'' movies. Look at how beefy Tony Stark is compared to how wire-thin Holmes is. That takes ''dedication''.
** Rob also was meticulous in making sure his accent was perfect for the character and historical period. As per Guy Ritchie's interview on ''Series/TopGear'', he succeeded.
*** It was perfect for modern perceptions, but it wasn't historically accurate. Historical British sounded much closer to modern Americans than modern Britons. It mainly revolves around [[http://www.lifeslittlemysteries.com/2047-americans-brits-accents.html rhotic speech]].
* FakeNationality: Quite a few examples.
** Holmes himself is played by Robert Downey Jr., making him a FakeBrit.
** Canadian actress Rachel [=McAdams=] plays the [[FakeAmerican American]] Irene Adler.
** Dredger, the large French man from the first movie, is actually French-Canadian.
** William Hope, a Canadian actor, played Standish, the American ambassador in the first film.
** Noomi Rapace, a Swedish actress, plays Simza, a French gypsy, though Rapace might have some Roma ancestry.
* FanNickname: Watson, due to being taller, thinner, younger and [[ShapedLikeItself more Jude Law]] than some previous portrayals, quickly became known as Hotson.
** Stephen Fry's version of Mycroft Holmes quickly took on the nickname "Frycroft".
* FandomNod: In the extended preview (aired during the ''Series/{{Monk}}'' series finale), there's yet another clip of the Holmes-Watson VitriolicBestBuds routine, then a cut to Adler going "They've been flirting like this for ''hours''." To the general public, a funny joke. To those aware of the Holmes/Watson-shipping fanbase, ''bloody hilarious''. As it happened, [[spoiler:this seems to have been a deleted scene referring to Watson's bickering with a boat captain.]]
* {{Jossed}}: Rumours circulated that Brad Pitt was in the running to play Moriarty in the second film. These were quickly denied, saying Pitt had never been considered.
* TheOtherDarrin: Jared Harris as Moriarty, in a way. Since, technically, he appeared always in shadow in the first movie and was played by Ed Tolputt in an uncredited role. In subsequent TV airings of the first film, as Jared Harris was brought in to re-dub Tolputt's lines to give it continuity with the second film.
* WhatCouldHaveBeen:
** Sienna Miller was in talks to star in the film, possibly as Mary. But when Jude Law was cast as Watson, this was quietly dropped - due to the couple's very public break-up when Law had an affair with their nanny.
** Sam Worthington and Colin Farrell were in talks to play Watson before Jude Law was cast.

!!Other films:
* AFIS100Years100MovieQuotes:
** #65, "Elementary, my dear Watson"
* IAmNotSpock: Basil Rathbone became perhaps the most famous actor for his portrayal of Holmes, usually with Nigel Bruce as Watson.

!!The [[Series/SherlockHolmes Granada TV series]]
* ActorAllusion: Charles Gray also appeared as Mycroft in ''The Seven Percent Solution''.
* DyeingForYourArt: David Burke's hair was actually grey.
** While Edward Hardwicke was bald and wore a wig for the role of Watson.
** Plus, Jeremy lost several pounds to acquire Holmes's slender look.
* TheOtherDarrin: Between the first and second series, Edward Hardwicke replaces David Burke as Watson. (Burke actually suggested Hardwicke to the producers.) The distinction is quite sharp - The Final Problem uses Burke, but Holmes returns to Hardwicke in The Empty House (they even reshot a few scenes with Hardwicke for flashback purposes). Overall, David Burke came across as much younger, more naive Watson, albeit one who resembled the original illustrations. Edward Hardwicke, however, was older, more distinguished, and more ex-military. Most fans agree Hardwicke was the more memorable Watson.
* RealLifeRelative: After a fashion. In the adaptation of ''The Problem of Thor Bridge'', the role of Neil Gibson is played by Daniel Massey, whose sister actress Anna Massey had been married to Holmes actor Creator/JeremyBrett from 1958 to 1962. Although the couple had divorced, due to Brett's [[BiTheWay bisexuality]], the split had been amicable, and the two had [[AmicableExes remained friends]].

!!Other television adaptations:
* Two actors who have portrayed Holmes share a birthday. [[Series/TheAdventuresOfSherlockHolmesAndDoctorWatson Vasily Livanov]] and Creator/BenedictCumberbatch were both born on July 19th.

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