Anachronisms: Early in the film, the Baroness claims to be a fan of Arthur Conan Doyle, citing him as a "fascinating writer"; but the story takes place in 1880, and Arthur Conan Doyle did not publish his first minor work until 1883, and was not well-known until the publication of the first Sherlock Holmes story - "A Study in Scarlet" - until 1887. Thus, the Baroness could not possibly have ever heard of Arthur Conan Doyle.
Crew or equipment visible: As the Doctor arrives in the train depot in Gorslava, the door opens and the camera pulling away is reflected in the door's glass.