List of things Ive noticed so far..
-Crosshair jumps around when flashlight is on
-People with lag (low fps) appear to run through and/or off things to other people and can sometimes be invisible
-Zombies can walk through fences and doors
-Lack of loot
-Zombies sometimes spawn inside furniture
-Characters lose all loot/gear when you exit game
-In game map doesnt show the entire world
-Game will occasionally only let you run in one direction (can be fixed by hitting alt I found).