- Continuity: 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.
- Revealing mistakes: 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.
- Audio/visual unsynchronized: 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.
- Revealing mistakes: 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.
- Factual errors: 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.
- Continuity: 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.
- Continuity: Near the start, as the girls are heading to the cave in the 4X4's, the spare wheel switches sides on the rear of the older vehicle.
- Continuity: When Holly is going through the first tight hole, she's pushing the rope bag in front of her. After she goes beneath the rock (through the water), the rope bag is gone, and isn't seen again.
- Factual errors: Cars in North Carolina are not required to have front license plates. Also, the license tag is made up of four digits followed by three letters; on North Carolina plates, letters precede numbers.
- Factual errors: Ice climbing axes, as carried by the characters, are used exclusively for climbing frozen waterfalls and would have no use inside a cave where the temperature remains constant, and well above freezing, due to being underground.
- Revealing mistakes: 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.
- Continuity: When Juno and Sarah are talking during their meal break, Juno has nothing in her hands. But when the angle changes she is suddenly holding an apple.
- Factual errors: The large dead deer the girls encounter at the beginning of their adventure is actually a North American elk. The elk's home range is predominantly in the west; you would not find an elk carcass in North Carolina.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Crew or equipment visible: SPOILER: When Holly drops and breaks her leg, about 45 minutes into the movie, the slip-wire is visible, reflecting in the light from the flashlights.
- Continuity: SPOILER: In the end, when Sarah has parked her car at the side of the road, the entire car is on the grass. When the trailer almost hit her, the car is back on the road. This should only be considered a goof in the US theatrical release. In the Director's Cut, Sarah is hallucinating the entire escape sequence, and any goofs can be considered part of the hallucination.
- Continuity: SPOILER: Towards the end when Sarah is driving along the road, the road markings change from US to UK. This should only be considered a goof in the US theatrical release. In the Director's Cut, Sarah is hallucinating the entire escape sequence, and any goofs can be considered part of the hallucination.
- Errors in geography: SPOILER: In the end, a logging truck is depicted speeding by on the North Carolina highway. The tail markings, reflectors, and technical gearing on it represent UK transit requirements instead of standard USA (OTR) specs. This should only be considered a goof in the US theatrical release. In the Director's Cut, Sarah is hallucinating the entire escape sequence, and any goofs can be considered part of the hallucination.
- Continuity: SPOILER: When the girls reach the cave, the blue truck parks and the BMW parks on its left side. When the last girl reaches the surface, she gets in the blue truck. When she goes to the truck, the beamer isn't there, but when she pulls out it's on the left again. This should only be considered a goof in the US theatrical release. In the Director's Cut, Sarah is hallucinating the entire escape sequence, and any goofs can be considered part of the hallucination.
- Continuity: SPOILER: When Juno falls into the pool towards the end (just before finding Sarah), when she resurfaces from underwater, her ice pick is bent. However, she then uses a straightened ice pick to help her climb the wall.
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