Ew. What a mess in our hallway! More scraping news...
We got most of the paint chips off the wall by scraping. Now to get the rest of the glue/paper mess, we used good ol' distilled white vinegar and mixed it with equal parts hot water. The trick is to work in small areas and really get it wet. It comes off super easy that way. I also found that you have to clean your scraper off often or it gets covered with glue and doesn't work very well.
In an hours time, here's what we are left with. Yes, it feels as smooth as it looks!
So a quick before and after: