1. Not sure if this has been brought up yet but in TA foward path when you have to kill the archers behind the shields by going through portals. Sometimes when you go through a portal your character will not be portaled for like 10 secs, then when your character is finally portaled you are randomly downed without touching the shield or dieing from damage.
2. In COF path 1 there is a bug at the fireboulders where you need to get 3 flames across to open the door. Sometimes the boulders are invisible and you can only see their shadow moving.