Great demo guys, It was really cool. It took me a while, but I found some bugs:
Zoom Bug:
Snipe all the way in with the p90SMG, and then switch to the Glock, the gun is still zoomed in more then its max zoom.
Double Jump:
Its hard to recreate this bug, but it happens every so often. You can double jump, press jump once and then press it again and you'll hit the celing from the bottom floor.
Stairs Bug:
Walk to the bottom of either staircase and look down wait there for a sec and then when you try to move up the stairs you can't even if you point your gun back up.
Those were hard to find, so don't worry. Great work guys.