One of the things that might get overlooked as audience members sit down for The Flash is the fact that Ezra Miller is giving two completely different performances as Barry Allen in the time-traveling thriller. As you can tell from the trailers that have played before The Flash opens this weekend, Barry Allen manages to travel back through time, where he runs into a younger version of himself. And Miller played both iterations of the classic DC hero, only, they filmed their performances months apart. Which is remarkable, when you watch the comedic timing between the two Barrys, the unique way that they interact in fight sequences, and just the way the characters play off of each other throughout the story.

The effect is seamless. And we understood how difficult it must have been to pull off during production. So when we got the chance to sit down with The Flash director Andy Muschietti and his producer/sister Barbara Muschietti, we asked if the root of the chemistry between the two Ezra Miller performances was captured on the set, or in the edit.