I appreciate that the show had two character explicitly ask if they're inside David's head or not. That's usually shorthand that they're in the real world.

Longshot or bust

So he'd be Mr Terrific?

I'm honestly assuming the person he remembers as his father is just whoever Gabrielle Haller married.

I think the funniest outcome is that Prometheus is actually an Alternate Oliver.

GOD DAMNIT, YOU GUYS DON'T HAVE TO TRICK ME, YOU'RE MY FRIENDS

That probably makes it funnier.

Best thing about it is when Cross goes the wrong way, comes back, and just stares at Bob like he wants to fight. It's perfect.

"How the hell should I know?"

Dril is also incredible because of how easily he (?) can be used to mock people.

[Extremely Dril voice]

Either "LOG OFF" or the boys are back in town one.

I WILL NEVER LOG OFF

The Taxi Driver from "A Study in Pink" shows up, somehow

And it made them think that they didn't have to do mystery episodes anymore.

To be fair, he'd be an excellent Joker

Yeah, the taxi driver was immune to the poison. Easiest way to tell is that in the first few murders, he has more and more pills in each bottle.

The show has established before that Mycroft thought he was significantly smarter than Moriarty

I just assumed all that was done when she had run of the prison again and could control everything that was going on.

This is a good reading that I think is correct, but it would've been nice if the episode went out of its way to explain any of that.