Continuity mistake: As Kahn is yelling at Bobby after he sees him kissing Connie over the fence he chases after Bobby and in one of the shots you can see the ladder Bobby used is gone. The following shot it shows Luanne in the bathroom and through the window we see the ladder has reappeared. The other change in the shots is the ladders and their size. Before the shot in the bathroom the ladder's height (Bobby's ladder) was enough it reached over the fence. As we see the ladder through the bathroom it's not even reaching the top of the fence.