When Ben Affleck was brought on board to play the Caped Crusader, he made sure screenwriter Chris Terrio came along to rewrite the script. But it looks like he's not the only one who got ahold of it. It seems like Affleck himself reworked it as well — and apparently while in his batsuit. I can only imagine, but I assume his face was somewhat similar to this when he saw the script:
The reports are saying that Ben would:
Go into wardrobe and get all suited up for the day in his Batman suit. Then he would sit around reworking the script. Ben wasn’t thrilled with it and would find himself on multiple occasions fixing it the day of.
Now how Batman-y is that? Rewriting the script to the movie you're starring in because you wanted to make it perfect is a bold move. And no one will stop you, since you are the freaking Batman!
Now, what changes he made are still unknown. My guess would just be some of the dialogue. This doesn't worry me all to much though, since he is an Oscar-winning writer and a huge fan of comics. So I think it's safe to say it was for the best.
Fearing the actions of a god-like super hero left unchecked, Gotham City’s own formidable, forceful vigilante takes on Metropolis’s most revered, modern-day savior, while the world wrestles with what sort of hero it really needs. And with Batman and Superman at war with one another, a new threat quickly arises, putting mankind in greater danger than it’s ever known before.
'Batman vs Superman: Dawn of Justice' opens on March 25th.