Not sure exactly where the line is drawn for PG, but here’s a list of everything that might be deemed even the slightest bit inappropriate:
https://www.imdb.com/title/tt2488496/parentalguide
Everything from “Snoke’s voice and perceived size may be frightening to younger viewers” to “A man uses a lightsaber to suddenly stab another man through the torso and holds the weapon’s blade in place for a couple of seconds as it scorches the man’s clothing and innards”…