In the scene when Ivy (the blind one) is runing through the forest at the end of the movie, she ends up runnig into a wall. If you look at the wall after she runs into it, it bounces. Then, at the scene when she is over the wall, it is a wooden fence. A wooden fence would not bounce like that. It Had to be a fake wall that she ran into. I understand that they didn't want to hurt her by having her run into a wall, but they could of at least caught the wall bouncing back and forth. It was quite funny. :)