I played the game about 60% through on a PS4 and decided that I needed to buy the PC version.
On my PS4 playthrough I passed the speech check with Father Godwin during Mysterious Ways mainquest and he tells me where Reeky is. I played on and assumed that was all there was to it.
However, on the PC gamplay my speech was not so high and it lead to some really great scenes and character building. It left me amazed that such a thing was completely missable.
Now I am wondering what other things I might be missing.