There were a lot of errors in this movie.
First, they claim the story takes place on Borneo. Wrong. They don't have jeepneys in Borneo, but in the Philippines. Funny, the credits talk about Philippine crew...
Second, tribes living in the jungle with only spears and bows with arrows for protection/food and only a cloth around the waist is a cliché and as far as I know, dead wrong.
Third, the special effects just suck. The helicopter tumbling after our "heroes" looks animated - and "glued" in. The ambient colors are different on the helicopter and surroundings.
Possible "spoiler" in the following paragraph... The story itself is a mix of "Alien" and "Predator". Those two movies are great - this one is not. We never get to understand the nature of the monster - and why it all of a sudden is so darn easy to kill it in the end. If that may be a surprising element...