- Critical Research Failure: Common sense would dictate that the characters shouldn't be able to have conversations underwater - since they have mouthpieces fully inserted into their mouths.
- Cliché Storm: The film was slammed for not doing very much differently from other such stories.
- Critical Backlash: With an 11% rating on Rotten Tomatoes, some find that the film isn't that bad.
- They Wasted a Perfectly Good Plot: Some viewers felt the film would have worked better as a simple cave survival story - and that the monsters made it too cliched.
- Too Cool to Live: Strode the Awesome Aussie gets killed off after only about twenty minutes of screen time.
- Visual Effects of Awesome: Despite the bad reviews, the effects for the creatures were praised.
The video game:
- Alternate Character Interpretation: Naturally, each player character can be a better or worse person depending on how you interpret the events of the game. The Twins, though, stand out. Given how they're heavily implied to have burned their own ponies to death, and the various deadly pranks they tried to kill their parents with beforehand, it's hard to see them truly reforming the way they're shown to do in the good ending. It's entirely possible to read the good ending as them telling the truth simply to avoid eating their own poisoned soup, and pretending it was out of remorse for their parents.
- Family-Unfriendly Aesop: You can get most things you want if you're willing to hurt or kill other people to get them...But if you are, the best part of you is already dead.
- Fridge Brilliance: At first, the treasures you have to bring back at the beginning seem fairly random: a jeweled skull from a pirate cache, an acting award, and a cursed guitar. Then, much later, you find the corpses of the previous party of three to enter: a pirate, a clown, and a robot. Those were the things they desired most. However, that may also lead to...
- Fridge Logic: Since the treasures are later replaced by your own characters who made the bad choices, did previous party actually made it to the end despite all evidence to the contrary?
- Fridge Horror: During the time Travel section, if you take someone to one of the earlier timelines, then walk around in a timeline later than that, you'll see a skeleton in the same spot you left them. Even moreso, this is required to solve one of the puzzles involving a boulder by holding it in place. The obvious implication is that your companion never left the spot they were standing and died there, even to the point of holding a rock in place. However, it does create a bit of fridge logic because despite the fact that up to a million years have passed and a history museum was built over the spot where they died, no one disturbed the corpse and their remains are left lying among the exhibits. Of course, this has plenty to do with the weird and timey-wimey nature of the cave.
- Part of what makes the Twins so creepy is that when you are not controlling them, they are always staring directly at the fourth wall. And all they want is their freedom to go outside and play. Which means that you're in their way...
- That One Achievement: Who Wants To Live Forever involves getting through a run without dying. Unfortunately, this is incredibly difficult to do, as there's plenty of things that can kill you in the game, such as falling to your death, mishandled dynamite, and being squished by floating platforms. Mistiming a single jump can force you to restart the entire game, even if you were near the end. You can't Save Scum either, as that runs the risk of deleting your save file, and it disqualifies you from getting it anyways. It doesn't help that the game has a tendency to glitch out at times, causing a completely random death to happen.