Flash Movie Production Start and the Reason Why… by filmjunkee
The Flash movie is set to begin production early next year in London almost directly after Justice League wraps. That makes sense, and Suicide Squad director, David Ayer, addressed the reason Zack Snyder directed that Flash cameo in Suicide Squad. It makes sense.
…Miller was in costume as The Flash for the first time earlier this year as production began in London on Justice League. It wouldn’t make much sense for Miller to fly all the way to Los Angeles to shoot what amounts to a single shot, and so Snyder simply snapped the footage during the production of Justice League and sent it over to the Suicide Squad post-production team.