Robert Downey Jr., Rachel McAdams and producers Joel Silver, Susan Downey, Lionel Wigram and Dan Lin are shown here describing Sherlock Holmes in a panel discussion at Comic Con 2009. I was interested to hear Downey Jr. describe how this film adaptation was based closely on Conan Doyle's work, saying they went "back to the source, so that was how we reinvigorated it, was by deciding to change less than had been changed previously."
Here's an extended trailer of the one released previously:
Here's the longer 22 minute video of the Comic Con panel:
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