I like the cool tracking device Batman had on his forearm that he used to track the whereabouts of the parademon. I like him diving and jumping onto the parademon itself. Conceptually, Batman hunting parademons is a cool idea. The whole fear thing was dumb and cartoonish though. I do like the line "Fear. They can smell it" said in the awesome Batfleck modulated voice.
What else... I like how Bruce looked during the lake scene with Diana and I like his cynical line about asking people they don't know to risk their lives.
I like Barry's funny "Did he just bail?" which was presumably added with ADR by Whedon.
I quite like the lasso of truth Aquman scene although it was really misplaced. The scenes preceding the final battle aren't supposed to full blown comedic. Maybe have a touch of levity here and there but that was a full on gag scene.
I also like Bruce addressing Diana shutting herself off from mankind for a century, him name-dropping Steve Trevor and Diana shoving him. That, I think, is probably the absolute best addition from Whedon.
I liked Arthur and Vic's little confrontation in the batcave and Arthur's attitude in general where he's super agitated and angry, throwing stuff and what-not. Oh I really loved Cyborg's way of tracking Steppenwolf's location with the digital globe he span around, zoomed in on, ect. (I'm only assuming that was a Whedon idea... Sounds a bit too cool and visually arresting to be though)