At 23:20 we are introduced to Miss Sherlock's older brother who works for a government intelligence office, just as Sherlock Holmes' older brother Mycroft.
Sherlock tells the police about the liquid bomb, called "Devil's Foot". "The Adventure of the Devil's Foot" was a Sherlock Holmes short story by Sir Arthur Conan Doyle.
At 11:43 the doctor enters Sherlock's apartment which bears the address 221B. The original Sherlock Holmes lived at 221B Baker Street in London.
Poldhu, the company manufacturing the micro-chipped capsules, is another reference to "The Adventure of the Devil's Foot". The story starts with Sherlock and Watson taking a health vacation in Poldhu, a part of the county of Cornwall in England.