Ok, here's one I've encountered.
There's this continuously occurring thing where if I get shoved into a wall, I get stuck there unless I RMB walk out of there. Out of the number of times that's happened, this is the first instance I've seen this:
A vertex or something got stuck on the mesh of the wall, and for the whole fight I had this tether stuck to my head. I have to admit, it was pretty funny and a nice change of pace. I kept hoping the axe guy would get clotheslined by it.
*Update, I guess 5/8/15:
Happened again on campaign and since there's more room, I ran as far as I can to see how long it would stretch. I kinda got slingshoted around and then it came off. Kinda like lagging--where your character starts running in place for a little bit, then everything starts speeding up, and all of a sudden you're 20 paces ahead of where you were.