Visible crew/equipment: Right when Chris is opening the refrigerator in the cabin, if you look closely behind him you can see a man walk up behind him, it's very brief but it must have been camera crew or somebody on set.
Continuity mistake: When the trooper is talking to Chris he has a wedding band on. When he's lying dead, it's gone.
Continuity mistake: Chris hooks himself to the troopers' truck. But when it gets to the house he's nowhere to be seen.
Continuity mistake: When Chris and Jessie are hiding behind the waterfall at night, Chris has his trouser leg rolled up (you can see the blood on his knee) and Jessie ties a white bandage round Chris's left knee, but when they wake up in the morning the bandage is gone. There is no sign of the bandage under his trousers. There is also no sign of blood from the bullet wound, even though earlier when Jessie was wrapping his knee with the bandage you could see that his knee was covered in blood, yet none of the blood soaked through his trousers. You can also see that there is no longer an entry wound or any blood on the back of his trouser leg. Later, when the cop gets an arrow in the eye, Chris climbs into the police car and the blood stain has reappeared on the back of his left knee.
Revealing mistake: When the cannibal throws Francine on the floor, you can see her pulse in her neck.
Continuity mistake: In the beginning, the female rock climber falls with her back toward the ground. But she lands on her stomach.
Continuity mistake: After Chris gets into the policeman's car, the mountain man shoots a single arrow that goes through the windshield and strikes the seat, but there are two arrows in the seat.
Continuity mistake: Near the beginning, when Francine and Evan are smoking while sitting on the car, the shots from the side show Francine with one leg bent and one stretched, while those from in front show both legs bent. (00:14:00)
Continuity mistake: At the beginning of the movie, when the male hiker gets killed, the blood drips onto the girl's face. Some blood drips by her left eye, and she wipes it off, with a slight smear remaining. The drop then reappears unsmeared, then is smeared again in another shot.
Revealing mistake: In the scene where Chris is hiding under the bed with Eliza Dushku and the mountain men bring in the corpse of the red-haired girl who was nearly decapitated by the barbed wire and dump it on the floor, the 'corpse' is still breathing.
Continuity mistake: When Chris Jessie Carly and Scott are at the Dead End Sign, if you watch Chris, he is looking at Carly and Scott, then looking away then back to looking at Carly and Scott all in continuous shots. (00:21:35)
Continuity mistake: At the beginning of the film when we see Chris waiting in traffic, in one shot you can see his hand on the steering wheel. In the following shot it's not. (00:06:25)
Continuity mistake: Close to the beginning after Chris crashes into the 4x4, he gets out of the car, and says sorry, and puts his left hand up, but in the following shot he has his right hand up, then back to his left. (00:11:45)
Answer: The chosen answer is incorrect. In part 2, the old man turns out to be one of them. He tells Dale, you killed my boy! The 3 cannibals are his sons.