From lead actors to character actors to cameos, pretty much everybody who could have returned to make Glass did, making the world that M. Night Shyamalan created so consistent and thus that much more immersive.
Having now grossed $100 million, it certainly appears that a lot of people have been enjoying that world, and while it looks like we may not visit it again, if we do, you can be sure the writer and director will do everything to make it keep feeling real.