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.