As a proper Sherlockian can I make the following point?
Watson had no children.
He was also a widower, Mary died.
If they are sticking to the basic facts of the books then Watson is childless, so make of that what you will....
Pissed me off a bit about Mrs Hudson tbh. She was a widow too, no double murderer as a husband, but I guess they have to add some drama. They would possibly only have included that if it was leading to something; why else give an erroneous detail about Mrs Hudson?
Sherlock Holmes was quite self aware in the book. Watson once listed his shortcomings. Hence he never attended social occasions and was very much a solitary figure. Having said that, he did show that he cared for Watson when Watson was almost shot in The Empty House.
One of the murder victims in the Sign of Four was killed in a room which was locked on the inside and no other apparent way in.
It was not a skewer that was used in the books but a harpoon, in Black Peter.
Another intriguing fact: In the Adventure of the Eligible Bachelor the bride goes missing during the Reception. It transpires that her first husband, whom she thought dead, had turned up at the wedding and she left to abscond with him.
She signalled to him by dropping her bouquet next to him - did anyone see who Mary threw her bouquet to? Sherlock wasn't it?
They may not be using that story, but didn't Holmes leave during the reception?