Warning: contains spoilers.

(you’re free to find the same for the previous episodeshereandhere.)

Andrew Scotts Moriarty references the title several times in series two finaleThe Reichenbach Fall.

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Is it significant in any way?

5.Nobody will have missed that this Tudor-style painting hanging in Mycrofts opulent home is of Mycroft himself.

Excellent work there by the production design team and artists.

7.Sherlock costumed his little horror girl in a blue dress with her hair in bunches.

Lucky guess or bubbling up childhood trauma?

I wasnt trying to invoke John Steed but theres something very Establishment about it- and thats what Mycroft is.

The Dark Government and the Old School Tie.

I think its his comfort blanket.

He may even sleep with it.

The umbrella comes from a wonderful old shop in New Oxford St. (Mycroft later describes Eurus torturing Sherlock with her coded song as her little ritual.)

the song of an exile nostalgic for the England of the past.

It could be a deliberately macabre reference to dangerous young girls, or…

I need a new contact lens prescription.

12.Mrs Hudsons vacuuming music of choice?

Iron Maidens The Number Of The Beast.

So now you know.

When instructed to play you he plays The Woman / Irenes Theme, first heard inA Scandal In Belgravia.

16.Sherlocks Production Designer extraordinaire, Arwel Wyn Jones, has a thing about elephants.

Look back over all four series and they pop up in print and ornament form all over the place.

Where is the elephant inThe Final Problems room?

Check out the make of the missing glass in Eurus cell.

It was first used in the TV show inA Scandal In Belgravia, then again inThe Sign Of Three.

18.The orderlies at Sherrinford wear yellow medical scrubs with a custom lapel crest featuring some kind of fortress.

As pyjamas, these would make excellent official BBC merchandise.

19.Either Moriarty or Eurus is a bit of a geek.

When his pre-recorded red alert message plays when the Governor locks down Sherrinford he says Klingons attacking lower decks!

Also cowboys in black hats!

When he does so at the prison, hes answered by a choir of criminals.

TV stations for train stations is a perfect BBCSherlockmodern swap.

24.Think back toThe Six Thatchersand the repeated motif of water reflecting on Sherlocks face.

Theyre taken to a special room and burned.

29.Sherlock is evidently a crime fiction fan.

30.Instead of Miss Me?, Marys second video is entitled Miss You.

And Mother Holmes appears to have forgiven Mycroft his lie by the looks of her comforting hand here.

Her, I mean.

Try not to, but, you know, sometimes… said Sherlock to Watson inThe Lying Detective.

You know where to find me.

SH It has to be to her, doesnt it?

Its only proper that he be part of putting his most famous creation back together.

38.Ive never spotted these (are they US-only?

Read Louisasnerdy spots in the previous episode, The Lying Detective, here.