Other mistake: Cami asks Spencer to unlock his trunk, which he does. After Cami takes her suitcase out, she slams the trunk closed. Cami walks about 1.5 miles straight, but ends up back at the car. When Spencer leaves, Cami gets out of the back seat and is able to open the trunk without a key. (00:16:20 - 00:25:31)
Other mistake: After Cami finds photos in Spencer's center console, she is able to see them while sitting in the back seat (perhaps from an interior overhead light). When Spencer approaches from behind and taps on her window, the interior of the car is dark and the photos are barely visible. Cami did not even try to hide the photos from Spencer, even though she suspects he was stalking her. (00:23:54)
Other mistake: The entire movie takes place during the overnight dark hours. Limited lighting from the car and flashlight somehow manage to illuminate faces, photos, signs, etc. Filming in the dark surely has its challenges, and there has to be a proper balance between lighting and ability of viewers to see what is happening. The "convenient" lighting would be a "deliberate mistake" except for one factor: A full moon (highly illuminated) is shown without radiating the light expected from a full moon. (00:26:25)