Well, I want to make this guide but I haven't enough time to complete with all the ends but I think that can help a lot when someone get stuck. Important things to know:
_I get stuck most of the time I've died. When you revive or load a savegame, the items droped or located on the ground disappear (seems it's a bug). So, if you are not seeing the sex aimations, try not to die!
_You can open the chest with tricorder (Little Bastard) or by shooting them 5 or 6 times.
_Somes barricades can be destroyed by shoot them 5 or 6 times.
This is for "Hell" difficulty: