Continuity mistake: When they're travelling in the coach, wideshots of them driving show them driving through deserted countryside. But in shots from inside the coach you can see the roofs of houses and telephone poles passing by.
Continuity mistake: In the close-ups of the scene near the very end of the film when the three girls and the guy get in the boat, there is no rain. On the wide shot, it is very badly raining and rain can be seen coming down as well as hitting the water. But as the shot reverts back to the boat, there is no rain to be seen.
Audio problem: In the scene where Maggie and Steve are running outside and come across Richard standing on a mine, he says something along the lines of 'This whole place is covered in mines'. As Maggie starts her next line, a voice in the background shouts 'no its not! haha!'.
Factual error: In the scene where the rocket launcher is fired and blows up the plane, the sound should have been delayed a second or two after the plane exploding.