I'm going to go through #ZackSnydersJusticeLeague Official Trailer and compare as many shots as I can to the Theatrical Release, previous trailers, and posts from Zack's Vero about the #SnyderCut

An overlay for Superman's death from Post-Viz, to the DC Fandome Teaser, to the Official trailer of #ZackSnydersJusticeLeague

Side-by-side comparison for the death of Superman.
#ZackSnydersJusticeLeague

Interesting to note when shifting to the 1.85:1 Aspect Ratio in the Theatrical Release, they had to do digital pans up/down the frame to convey the same information Zack had in the whole frame with 1.33:1.
#ZackSnydersJusticeLeague

An overlay for Steppenwolf taking down an Amazon.
#ZackSnydersJusticeLeague

Side-by-side comparison for Steppenwolf taking down an Amazon.
#ZackSnydersJusticeLeague

An overlay of Steppenwolf staring off into the distance.
#ZackSnydersJusticeLeague

Side-by-side comparison of Steppenwolf staring off into the distance.
#ZackSnydersJusticeLeague

An overlay of the Parademons hunting Amazons.
#ZackSnydersJusticeLeague

Side-by-side comparison of the Parademons hunting Amazons.
#ZackSnydersJusticeLeague

An overlay of the Amazons charging into battle.
#ZackSnydersJusticeLeague

Side-by-side comparison of the Amazons charging into battle.
#ZackSnydersJusticeLeague

An overlay showing the difference in Colour-Grade between Zack's Official Teaser and the Official Trailer with Hippolyta.
#ZackSnydersJusticeLeague

An overlay showing the difference in Colour-Grade between Zack's Sneek Peek and Official Trailer with Diana. #ZackSnydersJusticeLeague

Another overlay showing the difference between Zack's Sneek Peek and Official Trailer with the Uxas warning.
#ZackSnydersJusticeLeague

An overlay of Bruce talking to Arthur.
#ZackSnydersJusticeLeague

An overlay of Wonder Woman saving children.
#ZackSnydersJusticeLeague

Aide-by-side comparison of Wonder Woman saving children.
#ZackSnydersJusticeLeague

Two overlays of the explosion at Old Bailey's Cour House. The timing has changed between Comic-Con Sneek Peek and Zack's Official Trailer.
#ZackSnydersJusticeLeague

Side-by-side showing the difference in timing. They most likely rotoscoped each object in this shot and retimed it with the new explosion.
#ZackSnydersJusticeLeague

An overlay of Arthur swimming to an Atlantean outpost where a Mother Box resides.
#ZackSnydersJusticeLeague

An overlay of all the changes in Heroes Park with The Flash.
#ZackSnydersJusticeLeague

Side-by-side of the changes in Heroes Park with The Flash.
#ZackSnydersJusticeLeague