In the episode where Ned is a hall-monitor, Mr. Swinney has the popcorn in his hand checking on ned then he gets scared and jumps the some of the popcorn spills and it is not filled to the top but when the camera switches unto ned then the popcorn is filled again. but when it goes back to mr. swinney then it is not filled this happens at least 3 or 4 time very noticeable