After Hallie and Annie switch places, Hallie's Dad decides to get married. So Annie sends Hallie(who is in London) a fax. The butler takes the fax out of the machine, and the camera follows him as he walks into the dining room. The family is already seated in the dining room, and right before the butler enters the room you can hear the mom say something about the camp being six weeks long. It was stated many many times before that the camp was eight weeks long. I guess the mom forgot!