While playing, my friend found a problem area in the map. It's the place in the area that you start the game where you can jump down through the hole (when it's opened). Just wanted Treyarch to be aware of it. They probably are already. If you check my sig - there is an easter egg video guide for the map and at around 7:35 my friend is stuck.
FYI - I don't condone glitching, I didn't put how he got stuck and actually I don't even know how it happened.