Shinwell's daughter is named "Chivonne", which is pronounced the same as the Irish name "Siobhan", which is the Irish version of the name "Joan".
Three real life pro eSports players were featured in this episode, one of which being OpTic Gaming's Tarik "tarik" Celik.
The exterior of Chivonne's school is the former PS186. At the time of filming, the formerly dilapidated building had already been converted into apartments known as "The Residences at PS186".
Sherlock investigates the death of a former professional eSports player. The episode features real eSports players cast as fictional professional gamers.
Sherlock mentions getting key information from a Mountie named Montcalm. Louis-Joseph de Montcalm was the French commander in the war that lost New France to the British; he died in the Battle of the Plains of Abraham, 14 September 1759.