Greg Berlanti, Andrew Kreisberg and Geoff Johns spill the beans about The Flashs pilot episode…

Contains spoilers forThe Flashseason 1.

The Flashs pilot episode is a near-perfect rendition of the superhero origin story.

Here are some things 42, to be precise that we learnt from the commentary… 3.Greg Berlanti cried readingCrisis On Infinite Earthsas a kid.

They moved it all to the front after seeing an early edit.

6.Geoff Johns was also bummed when he readCrisis.

It inspired him to buy the 349Flashcomics that preceded it, though.

7.They thought they were going to do a lot of theSherlock-esque text-on-screen when Barry is at a crime scene.

However, they decided that it looked really weird, and like a separate super power.

10.The original pilot episode villain was going to be The Mist.

He would reform in the final moments of the episode, at which point Joe would have shot him.

11.Joe wasnt even going to make it through the pilot.

In an early draft, he was going to be killed.

12.They didnt always know that Eddie was going to be a Thawne descendant, either.

13.Another early draft for the pilot began with Barry on the train back from Starling City, after hisArrowappearance.

He would have met Prof. Martin Stein on that train.

This meeting was moved to later episode, but it still takes place on the train.

14.Caitlins fiance was initially going to be The Mist.

He would have been seen with Caitlin in the pre-particle-accelerator-explosion scene at S.T.A.R.

15.The thief who steals Iris bag at the S.T.A.R.

Labs launch event is Colton Haynes stunt double fromArrow.

16.The original cut had an angry meet-cute between Iris and Eddie at the CCPD HQ.

It wasnt really necessary and Iris came out of it a little harshly.

17.Some shots from theArrowepisode where Barry Allen is struck by lightning are reused in this pilot.

Its structured in a way that deliberately doesnt contradictArrow.

18.Barrys search for his father has always been considered a key theme to the show.

20.What does the water going up mean?

is one of the most asked questions from fans.

Apparently, we wanted something cool to happen.

Because the equivalent of air pressure is changing.

A Flash moment was about to happen.

Or you get too close to an area where time travel technology took place.

21.The entryway to the main S.T.A.R.

Labs room is in a different location in the pilot to where it is in the series itself.

22.Carlos Valdes had actually never been on camera before he appeared onArrow.

He was really nervous.

23.The Easter egg of Grodds cage was a hard one to keep in.

25.Tom Cavanagh always knew that Harrison Wells was responsible for Barrys mothers death.

It was part of the reason he signed on.

26.Tom Cavanagh ad-libbed the line yeah, keep the sweatshirt.

27.The original Jitters was an actual location.

They couldnt afford to build a set yet.

28.The big post-coma reunion scene is actually the first scene Grant Gustin and Candice Patton shot together.

In the comics, though, he catches them all.

They wanted to dramatize the fun of being a superhero.

32.Wells takes off his glasses as Barry recounts the story of his mothers murder.

Its his Clark Kent thing.

34.Jesse Martin (Joe) needed something different than just a standard detective character afterLaw & Order.

Prior to this direction, Amell had been delivering lines in a more standard Arrow-speak tone.

All of a sudden, Stephen was doing this amazing soulful performance.

36.This is the same roof used in theLegends Of Tomorrowtest footage that has done the rounds online.

37.The teams behindArrowandThe Flashsee the former as a night show and the latter as a day show.

The Arrow is our Batman and The Flash is our Superman.

Theres a featurette that shows just how detailed the digital double is.

39.The script reads, and for the first time Caitlin smiles, after Barry unravels the tornado.

Give it to Grant, but dont give it to John.

The resultant line was you wanted me to change my name.

Both actors started crying.

41.In his final scene from the pilot, Cisco is wearing a Bazinga T-shirt.

This was sent to the production fromThe Big Bang Theoryteam, because Sheldon often wears a Flash T-shirt.

42.Harrison Wells secret room scene, devised as a post-credits sting, was always in the script.

The original headline from the future newspaper was the less-specific Flash Saves Central City.

Barry mentions legitimate reports of a man who can speak to fish at Amnesty Bay.

Inevitably, this has ended up online…