One of the biggest differences between the theatrical cut of Justice League and Zack Snyder's Justice League was a pivotal scene near the conclusion when the team is actually bested by Steppenwolf and Ezra Miller's The Flash actually goes back in time to save them. This specific moment was apparently one of the scenes that Warner Bros. didn't quite understand, which we could have guessed based on how no part of it was put into the 2017 version. Speaking in a new interview though, VFX Supervisor John "DJ" Des Jardin confirmed outright that the studio didn't get it and wanted it out.