Sherlock Season 4 Finale: 13 Dumbest Moments From 'The Final Problem'
10. Sherlock Can't Tell There's No Glass
Speaking of the glass, by the time Sherlock makes his way to Sherrinford the case containing Eurus has gone.
That's weird enough, but believable within the framework of Eurus making everyone do all of her bidding (though why she then stays there, even though she's technically free, I don't know).
However, while it may still look like there's a glass case, it's then revealed that it has actually gone. It's a stretch that anyone in that room wouldn't notice, but Sherlock? One of the greatest, most perceptive minds in the entire world, couldn't tell there was no glass? Come on.