Goofs

(at around 2 mins) Right at the beginning of the movie Juno gets pushed into the water. Moments later when she gets out of the water, her hair is completely dry when she takes her hat off.

(at around 41 mins) When the girls are crossing the first chasm. The first two have crossed and they are hooking up the third one, you can clearly see four people behind the third.

(at around 16 mins) As the girls are heading to the cave in the 4X4's, the spare wheel switches sides on the rear of the older vehicle.

(at around 1h 17 mins) When Sarah falls into the pool of blood, the torch falls behind the big rock to her left. In the next shots, the torch is on the top of the rock.

When they first cross the chasm, they drop a rock and hear it hit bottom. When they come back later, Juno jumps, and it's revealed that there is a lake below. They should have heard a splash from the rock, not a thud.

All of the spines in the various bone piles throughout the movie have the spines intact and the inter vertebral disks still present in the spines. Inter vertebral disks, however, are cartilage, not bone, and would have decayed (especially given that there is no clothing, hair, or fur in the bone piles, meaning that the bones are quite old). The spine segments should be scattered and in pieces, not in long segments.

(at around 20 mins) The dead deer the women find prior to entering the cave is a red deer, which is is not found in North Carolina.

(at around 43 mins) While the rock climbing scenes in this movie are technically an order of magnitude better than most Hollywood attempts, when Juno follows across the first chasm, she wouldn't have bothered to re-rack the cams she was collecting to the gear loops on her harness. Completely unclipping them from the rope is both unnecessarily energy expending and dangerous, since she could easily drop a free cam into the abyss below. Most climbers faced with following a leader on a roof like that would simply disengage the cam from the rock and let it slide safely down the rope where it would collect by the climber's harness for later racking.

(at around 46 mins) The cave drawings featured a woolly rhinoceros which lived in Eurasia. None have been found in North America. They lived during the Pleistocene epoch (1,808,000 to 11,550 years before present) and are known mainly through cave drawings. Recent carbon dating has shown that populations may have survived as recently as 8000 B.C. in Western Siberia. A nearly complete specimen was also found in a tar pit in Starunia, Poland. The oldest known cave paintings are approximately 40,000 years old.

(at around 3 mins) Copper water pipes wouldn't penetrate the front windshield of a car. They are too soft to do so. While they could crack the windshield, they deform to the point where they would be unable to proceed forward after cracking that windshield. They certainly wouldn't have speared the male passenger or the accompanying child through an auto windshield.

(at around 3 mins) When the copper poles slide off the driver's roof towards the car Sarah and her family are in, the ends start off perfectly round, then suddenly become sharp and pointed, then become round again when shown in the aftermath of the accident.

(at around 52 mins) Sarah flashes her torch hearing a noise and it highlights the first 'crawler' drinking water from a pond. Upon the flash of the torch it looks towards Sarah and disappears. According to the plot the crawlers cannot see, they respond only to the sound.

(at around 46 mins) The characters find cave drawings on the walls, supposedly drawn by the crawlers. Who are completely blind. The cave drawings are a nod to the crawlers origins as cavemen who stayed underground. They would have been made thousands of years ago and aren't suggested to have been done by the 'modern' blind crawlers.

Several times throughout the movie, as characters brush up against stalactites you can see the stalactites move. Stalactites are rigid formations and do not sway or bend with contact.

The green light almost never matches the green glowsticks supposedly casting them. Several times the actors' shadows fall in the direction of the glowstick, rather than away from it.

(at around 30 mins) In the first tunnel, when the camera follows one of the girls climbing in it, you can clearly see the wheel marks of the camera on the ground.

There's a very cinematic shot of a skeleton's hand reaching up out of the cave's bone pile. However, with no flesh or tendons to hold them together, the 27 bones in a human hand would fall apart.

(at around 1h 25 mins) When one of the girls falls and tries to get up to a tunnel, she grabs a large rock to help herself up. You can see the rock bend and wiggle under her weight.

(at around 1h 22 mins) When entering the cave while rappelling none of the girls have gloves, this would result in extreme burns.

(at around 1h 21 mins) When one of the girls is looking for climbing equipment, but doesn't have any with her, she says, "Oh, fuck," but her mouth doesn't move.

(at around 25 mins) When Juno lights the flare to reveal the interior of the cave, a crew man is visible below them.

On the 4x4 can be seen UK-spec headlights for left-hand traffic, showing that the vehicle in question was definitely not in North Carolina.

For any species there is a minimum viable population, the smallest possible size of a biological group that can exist without becoming extinct. For terrestrial vertebrates this would be in the thousands.

As the creatures go above ground to hunt in the day time (and there is no reason why they would also not go in great numbers, having no fear of people or even bears), it is inconceivable that they would not have been noticed, or even photographed, by large numbers of people.

The fact that the cave system was unexplored and not the cave system that the group had planned for should have become apparent very quickly. It's unlikely that it would have matched any maps or charts Juno would have had. And the absence of any trash, footprints or signs that climbing gear had been used there would have evident. It certainly wouldn't taken experienced cave explorers much time to notice the discrepancies.

(at around 22 mins) Sarah is supposedly an experienced climber. When abseiling into the cave, she is seen awkwardly holding both hands on the rope below the figure-8 braking device. Climbers hold one hand above the device (to maintain balance) and one hand below (to slow the descent).

The girls don't use moth guards when they are climbing.