Actually most of what was cut was just dialogue. Although, that's just the stuff we know got cut, who knows what was planned but scrapped before it was implemented/got deleted outright.
Some of the stuff that went unused but is still in the game files is interactions with Steve Scriggins, the one shot gator from the first Gregg hangout. Originally you could find him in a run down building ripping copper out of walls to resell, and talk to him.
He and Mae would have little dialogue spats until Scriggins finally gets pissed on the 4th or 5th visit. He asks Mae why she even shows up and why she hates him so much.
She tells him he was a massive dick in High School, and he says maybe I was but you're still a massive dick and almost murdered someone, so stop preaching to me and fuck off or I'll make you fuck off. To which she scoffs and calls his bluff he's not going to actually get aggressive, but she otherwise shuts up and you can't interact with him after that. (paraphrased)
I think that was cut mostly because this would have been around the same time they're trying to delve more into Mae's issues and portray her as a tragic character to be pitied. And it'd be a little hard to keep pitying her after the guy she thinks is literally Hitler tells her off and she has no retort except to call his bluff.