- Why does the plant imitate a cell phone? Because it's a sound that humans will instinctively approach. (They also learned the sound from one of their previous victims, which Amy stumbles into when searching for the source of the "ringing").
- After the Mayans have penned in the group with weapons, why don't they just shoot them and get it over with? It's part of their deal with the plant; once it's got victims to play with, they don't interfere with its fun.
- There's a good reason why the Mayans were trying to contain the vines-but Amy escaped the quarantine. Guess what—now the Mayans have to find and destroy her body (and the associated growth) or the entire ecosystem is likely screwed.
- The movie seems to suggest that the vine can only get into the bloodstream through a cut. A big deal is made about Stacy accidentally cutting Jeff's hand - he's now vulnerable to getting infected. Notice how Eric never gets cut and he is never shown to have it growing inside him. Additionally I'm sure there are chemicals capable of destroying the vine once Amy gets back to civilisation. Of course this depends on what ending you take as canon - if you accept the one where Amy has the vine growing out of her eye then yes the ecosystem is screwed.
- The vine doesn't have to be living inside of her to be a problem. It causes some sort of growth on their clothing, hinting that it produces spores that attach to anyone who gets too close. If she's going through the forest, then those spores likely know to detach. Once it's spread into the rainforest, it can evade easy detection and go wherever it wants, not to mention the fact that it can simply enter the body wherever it wants as well instead of waiting for an open wound.
- Even worse if it gets out of the rainforest and spreads worldwide. The US south has issues just dealing with Kudzu infestations, a highly nutritious leafy vine, let alone something intelligent and carnivorous.
- The movie seems to suggest that the vine can only get into the bloodstream through a cut. A big deal is made about Stacy accidentally cutting Jeff's hand - he's now vulnerable to getting infected. Notice how Eric never gets cut and he is never shown to have it growing inside him. Additionally I'm sure there are chemicals capable of destroying the vine once Amy gets back to civilisation. Of course this depends on what ending you take as canon - if you accept the one where Amy has the vine growing out of her eye then yes the ecosystem is screwed.
Fridge Logic
- It seems as if it would be a good idea for the Mayans to do one of two things to prevent what ends up happening in the movie from happening again: (1) learn multiple languages so that they can't only point, mimic, or gesture to visitors to keep them from going into the ruins and touching the murderous plants. (2) attempt to build some kind of wall or structure that physically bars people from entering the ruins. Naturally, it may not be considered their responsibility—after all, people warned those visitors and they just ignored said warnings—and there is also a chance the vines can knock down anything they put up, but it would still possibly save more future tourists if they adopted one or both of these policies in the future. As it stands, the Final Girl may have just doomed all of mankind because the Mayans didn't do one of the two options discussed here.
