Eric Wallace spoke to CinemaBlend and other outlets at SDCC round tables about how "Crisis" enabled the Flash team to handle its season in a new way, saying this:
I think 'Crisis' happening when it's happening now has turned out to be the biggest blessing for this show possible. Because what it's doing for us is we have something that has to be dealt with in the middle of our season. We know when it's going to air, in the fall, in December, whenever it is. So we have to draw towards that. So it gave us a season that wrote very neatly into kind of three sections.
The Flash (along with the other shows of the Arrow-verse, following the precedent set by Arrow way back when) generally features a midseason finale with a cliffhanger to keep fans on the edges of their seats throughout hiatus, but keeping the same bad guy.
Thanks to "Crisis on Infinite Earths," The Flash Season 6 can be split into three sections, and considering how "Crisis" will be split
between fall and midseason, the normal midseason finale format wouldn't work.
If knowing that the season will be split into three isn't enough for you, Eric Wallace continued to share some of what to expect in each stage:
Pre-Crisis, building up to the dread that's hanging over them, what's going to happen, and where's The Monitor, and what is he going to promise or not promise, what's going to happen to Oliver. All these things, and then Crisis itself, which is its own self-contained kind of miniseries. But what it did for us was what's post-Crisis even look like? We've been waiting for five and a half years with this newspaper, holographic thing hanging over us. We'll work here now. It's not 2024, it's 2019. Once we get past that, it's a whole new game. It's a whole new world. I'm a very comic book geeky guy, so let the geeky comic book games begin, starting in post-Crisis. And I think you're going to see that in Season 6. A little bit more of a comic book feel, while also deepening the character.