When Capt. Rawley goes to the motor court to get Det. Patrick at the beginning of the film, the exterior location shot shows Rawley looking though the window of the cabin at Patrick inside. In the next obviously studio shot, the window and frame are completely different.
When Det. Patrick goes to the snowbound mountain cabin to get Eden, the exterior location shot shows a lot of snow on and around the door. In the next obvious studio shot, there is hardly any snow and the door itself and the cabin's siding is different.