Search them for words? Try pdfgrep with recursive - very easy to setup and try. If you feel like that’s taking too long, you probably need to accept some simplifications/helper structures.

I still don’t know who he was. Just that many people were deeply unhappy with his existence and that he was perceived as far right. I also don’t care.

It’s not a grammar mistake per se, but I feel like sharing it and it is close enough so here we go.

As a non-native English speaker: How can you have mob and vacuum the floor but not broom the room?! I know it doesn’t exist, but I don’t care. If we have to phrase it as a grammar mistake: I use verbalisations where they are uncommon.

That’s the beauty. Given that there is no goal, you are able to define your own.