Sherlock Season 4: 20 Easter Eggs & References From The Six Thatchers

2. Reigate Square

Just before this scene, we cut to Mycroft apparently getting some takeaway. On his fridge, we see a bunch of menus. The one he decides to go with is labelled Reigate Square.

This is a cheeky nod to a Doyle story with a very similar name - The Adventure of the Reigate Squire.

It's a testament to the layering of Doyle easter eggs found in Sherlock that this one comes just seconds before the biggest and most notable reference in the whole episode...