Continuity mistake: As Jody is shown up close talking in the classroom, her hair (usually black) looks dark grey in this shot - then after a camera angle change with her further out, suddenly her hair is black once again.
Continuity mistake: When Daria and Kevin are talking in front of the lockers early in the episode, the lockers don't have any numbers on them like they normally do in other episodes.
Continuity mistake: The blackboard behind O'Neil has a face drawn on it with tears coming down on each side of the face. In some camera angles, three tears on each side are shown, and in other camera angles, only two are shown. This number of tears keeps alternating.
Answer: "Mack Daddy" was a 90s phrase meaning "Ladies man," and Mack simply doesn't like the stupid nickname.
Brian Katcher