Eiling recovers behind Waller during her confrontation with Batman, but the next shot taken at a distance, revealing Batman's departure, shows him lying on the ground to Waller's right.
When the League turn themselves in, J'onn is behind and to the left of Superman, but when the shot changes from Superman to the right of The Flash, J'onn is to his right. When The Flash makes an excuse about Batman's absence, an overhead shot reveals Green Lantern is now the one immediately behind Superman, placing himself in between him and J'onn.
When putting out his final word refusing to surrender to the authorities, continuously when speaking with Waller, and when confronting Luthor, Batman's eyes are gray rather than white.
Booster Gold appears on the Watchtower but in "Flashpoint" he was one of those dealing with Cadmus on the ground.
From when Steel says the power will return in 18 seconds, only 13 seconds actually elapse until the tier finishes its cycle.