Other mistake: Robbie gives Tori a chocolate leaf-blower as a present to cheer her up. Then when Robbie leaves to go join Cat at the Platinum Music Awards, he supposedly takes his chocolate leaf-blower present with him. But, in the shot where he leaves Tori's house, the bag that the chocolate leaf-blower was in is still on the floor.
Continuity mistake: In "Tori Goes Platinum" (Season 3), in the last scene when the credits are rolling and Cat and Oliver are eating Bibble, it isn't colored like the rest of the episode.
Answer: The Director hated working with Melinda, but knew that her superstar popularity and status would get his movie a big buzz and higher ratings. And the movie was discontinued for a re-audition to fill-in Melinda's leading/major role.