In the scene where Kristy is making sandwiches for her and her father for the picnic, she is bagging them up. Her mother comes in and starts talking to Kristy. It shows that Kristy is bagging one sandwich, and one is already bagged, sitting on the counter. Kristy finishes bagging the sandwich, then, walks away momentarily. Kristy then returns and only one sandwich is bagged and she starts bagging the other.