Light from the environment can be seen shining through the mouths of characters even in cutscenes.
One of the NPCs broke her leg going through the Ordeal. She can be seen walking on that leg, which is impossible to do if the leg is broken.
The clothing used by all characters is not good enough to keep out cold.
Creatures like crickets and red-winged blackbirds can be heard throughout this expansion - creatures neither found in frozen places nor on mountains.
If the Yellowstone base was sufficiently advanced that it could suppress a volcano, it should not be so easily deceived into assuming that there is a fire within simply by some smoke being sent into an intake vent.
Enemies do not raise enough of an alarm when they see one of their own dead.