The GPS coordinates that Nathan gives to Audrey (N44.9137 W67.0039) are located near the easternmost border of Maine, just northeast of both Eastport Municipal Airport and Shackford Head State Park, in Maine, and about 1 mile from the Canadian border across Harris Cove.
Claudia Black and Emily Rose worked together on several of the Uncharted games.
Grady was also the name of a former caretaker of The Overlook Hotel in Stephen King's book "The Shining"
The Kitchener Mill is mentioned, which is most likely a nod to the Kitchener Iron Works from Stephen King's It.
Claudia Black (Moira) was in Farscape. Moira was the name of the living spaceship from that series.