When Cloe and Kitty are in their room talking about music, Kitty takes of her boots three times.
While the two kids are skiing behind the train, the snow between the rails appears and disappears between shots.
In the scene on the cliffs before the final showdown, a squib/bullet hit is seen on the rock wall behind Will before any shots are fired from the helicopter.
Near the end of the movie when they jump out of the sky lift, seven people jump out, yet there are only six people.
When the producer is being dangled over the edge of the building, his leg returns to vertical by a very unhuman path.
At the beginning of the movie when Ian and Will are hanging in the kayak, Ian's phone rings three times even though he has picked it up and said hello before the third ring.
In 2002, Yugoslavia didn't exist any more. Austria's Carnic Alps, where the movie takes place, border on Slovenia, a country independent since 1991.
At the end on the mountain there is only one camera present, yet the resulting video shows someone holding that camera.