Continuity mistake: When Daria is talking to her mother after getting home from visiting a college, the picture board on the wall above the stairs is blank instead of the usual pictures of the family and when the girls were much younger. It returns to normal later in the film.
Continuity mistake: Quinn mentions to her new coworkers at the restaurant that this is her first job, but she already had a job in episode 3-7 (It Happened One Nut) in a pet store.
Continuity mistake: As Daria and Jane are talking to each other in front of the lockers in the hallway at school, the locker to the right of where Daria is standing is locker #307, then shows it as #104, then #307 again.
Answer: "Mack Daddy" was a 90s phrase meaning "Ladies man," and Mack simply doesn't like the stupid nickname.
Brian Katcher