We even found old old wallpaper underneath the stuff we were tearing off. Maybe that's why the most recent stuff wasn't sticking very well. At most of the seams, it was peeling back. There was even one section the previous owners had "patched" with clear packing tape. Awesomesauce.
But mostly, it looks like this, which is smooth enough to seal, prime and then paint. Looks bad now, but it's going to look great soon. :-)
Also, I decided I wanted to move the dresser into the closet in the guest room, but unfortunately, this little piece of wood is in the way. We're not sure if we can rip it out or cut it or what. Any suggestions?