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The Snowmen features a first-ever special effect for the series: a single camera shot following a character (Clara) from the outside of the TARDIS, through the doors, and into the console room.
The Doctor first met the Great Intelligence in his second incarnation in the story Doctor Who: The Abominable Snowmen: Episode One (1967). He battled against them again in the London underground in Doctor Who: The Web of Fear: Episode 1 (1968). A map of the London underground appears on the top of the lunch box The Doctor gives Dr. Simeon.
When The Doctor is introduced as Sherlock Holmes, the music mimics the style of David Arnold's music from the show Sherlock (2010) which is also by Steven Moffat. However, due to copyright reasons (they would have had to pay Arnold), the tune is not quite the same.
Neve McIntosh played two other Silurians, Alaya and Restac, in Doctor Who: The Hungry Earth (2010)/Doctor Who: Cold Blood (2010).
The Doctor impersonates Sherlock Holmes, a role already played by two previous Doctors - Tom Baker and Peter Cushing. Steven Moffat, the head writer of Doctor Who since 2010, also co-wrote Sherlock (2010). Sir Ian McKellen, the voice of The Great Intelligence, later played the retired Sherlock Holmes in Mr. Holmes (2015).
