Walking backwards can clip you through walls
If you approach a wall by walking normally forward, at the wall you'll stop/slide, which seem intended. However, when walking backwards, you can go right through (or after a short while). You can move then even further away from the area, but it seems there isn't really anything outside.
The only good thing I've found is that then you don't need to use the mouse for turning since you can then talk to people from behind.