Visible crew/equipment: At the start of the first shot in Principal Matsui's office, when Ms. Darbus and Coach Bolton are arguing about detention, the camera's reflection is visible on the computer screen as it's tracking backwards. (00:21:05)
Visible crew/equipment: When "Stick to the Status Quo" is starting, the camera pans down from the balcony past Sharpay. As it goes down, you can see the camera reflected in the balcony's glass screens.
Visible crew/equipment: At the final callbacks, when Ms. Darbus calls Sharpay and Ryan onstage, the reflector screen is seen in her glasses.
Answer: Well at the start she was just doing it for fun and because Troy was doing it. But as they went on she just wanted to get the role because it would have showed the school that she wasn't the freaky geeky nerd girl. So she put out all the thoughts of the audience till they actually had to be there.
Movieman123