Right after Rusty ties the doorknobs together, as Jesse, Stephanie and DJ are pulling on their doors the wall by the girls' room can be seen shaking. This wouldn't happen if it was a real wall.
On Joey's videotape that Rusty recorded over of himself, the camera moves around on a tripod, keeping him in frame. Since Rusty taped himself, the camera should have remained still.
It makes no sense that Danny wouldn't notice Rusty putting the table cloth in his pants.