When Dr West is trying to climb out the manhole, the water in manhole is inconsistent with the water above the manhole.
When the soldier fires a grenade into the warehouse, the entire floor erupts in flame, as though a gasoline bomb has just been set off. The grenade fired is a 40mm grenade from an M203. 40mm grenades do not explode in this fashion.
The C4 used to blast the flood gates already has a hole in it for the Primer, before the demo guy has pushed the Primer into it.