As they trap him, an overhead view shows two cop cars on each side of the killer's car, with no room for the doors to be opened. A closeup view shows him open the door wide and he gets out to escape.
When the first killer is escaping in his victim's car, the outside view of the car shows that the rear window is misted with rain. But when seen from his POV in the rear-view mirror, the window is clear.
Sven's body is frozen stiff in the barn. But Nick and the others have left him seated behind the wheel of the cab for someone to find. All the bodies have been too frozen to reposition and not enough time has passed.
The entire titular concept of a "hibernaculum" makes no sense. Since the varme tyv can't generate their own body heat, they would not benefit from huddling together with others of their kind in a hibernaculum since none of them have any body heat to share with the others.
The entire premise of the varme tyvs makes no sense. If they cannot generate their own body heat and at the same time cannot use heat from any other source than human bodies, then it would make no difference to them if it was winter or not - they would have to leech heat from humans all year around..
When the cops realize the victim is a driver for Bridgetown Cab, Detective Griffin lifts his phone and starts talking to someone at the cab company without dialing.