Playing Witcher 3, I have surprisingly experienced few glitches. A couple times falling into holes I could not exit, some experiences with rotfiend head explosions artifacting after long play sessions and only 1 crash to desktop. That’s a pretty good sign considering the massive size of the game.
Today after about an hour and half of play I encountered an interesting glitch when heading to a new ! to take a quest. A prostitute had no face during the dialogue scene. After exiting the scene I found her face turned sideways and several game feet away from her character.
On a hunt I decided to keep looking around the town and found several a character in a “T-pose” or default pose. Then I discovered more detached heads, including one walking with his head floating nearby.