Corrected entry: After the principal of the school has told the crowd and basketball team in the gymnasium that they will have to leave the room due to safety regulations (this is before Breaking Free), as the team pace out of the room, in the bottom right corner, you can very obviously see a camera man follow them out of the room before the shot changes to Ms. Darbus.
Corrected entry: As people file out of Ms. Darbus's class the day after winter break, the kid with the yellow undershirt and the blue jacket comes out of the classroom twice: once when he says to Troy "She's crazy." and another time when the camera switches back to Gabriella as she's explaining her mom's transfer.
Correction: It's likely that he had gone back into the classroom to collect forgotten books for next period.
Corrected entry: When Troy is playing basketball at practice during the song Get'cha Head in the Game, his jersey says 14 with his name, Bolton on the back. Later, at the next practice, his jersey number is 10. And at last, at the game at the end, his number is back to 14.
Correction: Having experience in basketball, I know that Troy could have easily had 2 jerseys.
Correction: That is a camera crew filming the game; we have a crew film our school's football games and put them on public access cable channels.