When Darlene sits down to watch a basketball game with her Dad, her hair is parted on the right, and remains that way for two shots. The third shot of Darlene has her hair parted on the left. From the fourth shot, throughout the rest of the scene, her hair is parted on the right.
As Dan is bragging about Darlene's softball performance at the beginning of the episode, he mentions that she had no walks. Darlene then implies that she hit a batter with the ball. This automatically results in a walk.