Factual error: Tori donates three pints of her blood. There is no way that the hospital would have done this in real life seeing as it takes about eight weeks before a person can actually donate blood again.
Plot hole: When Tori is at Nozu, in the tweet she states that she's using their computer, well, why didn't she use the computer or social media to contact someone at the school to come give her and Robbie $22?
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.