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: I'm not positive, but that is what I've always assumed.