Corrected entry: In the second half of the film, after the remaining cavers are trying to escape the creatures, there is a scene where one of the girls attempts to slide through a hole. She hears something behind her, turns and shines her torch around the cave and discovers that several of them are there watching her. She then jumps in the hole and starts to crawl away as quickly as possible. The mistake is to do with the lighting. In the shots which face her, with the small hole behind her, the cavern is bathed in green light from the fluorescent tube. However in the shot showing the torch moving around her and revealing the creatures, there is no green light - it is pitch black, obviously for dramatic effect. The green light is very strong and lit up one of the caverns earlier, why not this one.
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Correction: This is more of a question than an actual mistake, and you've pretty much answered it yourself. The shot revealing the creatures does not have the green light for dramatic effect. This is also a deliberate mistake, not a continuity error.
THGhost