When Eph and his companion arrive in Quarryville, he finds a cellphone belonging to Emily, who made a vlog. During one of the scenes, Emily is shown holding her cellphone but it appears that someone is making a video of her when she is suppose to be alone.
Dr. Himoff was concerned that giving Setrakian amphetamines to wake him up would be dangerous because it would put too much stress on his heart. But then, upon Eichorst's insistence, he orders the nurse to give Setrakian 600 mg of dextroamphetamine, a dose that would almost certainly be lethal to any person, and would defiantly be lethal to an elderly person recovering from major surgery. The maximum daily dose of dextroamphetamine is 50 mg, sometimes doctors will have to use more to reverse the effects of sedatives, but they would never go over 100 mg.
The convoy scenes are said to be located in the Black Hills, North Dakota. The Black Hills are in South Dakota and Wyoming.