Revealing mistake: When Neil is in the raft with the boys talking about wanting Victor back, just as Neil climbs into the water we can see the safety cable attached to the back end of the raft. (00:38:30)
Revealing mistake: At the start, when the girls in the bunk are standing in front of the mirror, the first shot of them looks as if the camera is facing the mirror and we're seeing their reflection, but note that neither the buttons on Alexa's blouse nor her white bracelet are on the opposite side. The "mirror" is actually regular glass with the girls standing behind the glass to mimic a reflection, though Alexa's blouse and bracelet reveal the secret. (00:03:05)