Continuity mistake: During the "Status Quo" number, we never see Gabriella walking through the cafeteria in the wideshot, after she talks to Taylor, unless it is a close up shot of her.
Continuity mistake: When Gabriella gets her picture taken on Troy's cellphone, she looks directly at the lens. When Troy looks at the picture, it's an angled shot of Gabriella and she's looking elsewhere.
Continuity mistake: Near the end of "Start of Something New" when Troy is saying "new" he moves the mic away from his mouth, but you can still hear him saying "new" before he puts it back to his mouth.
Continuity mistake: When Kelsi trips over as she walks away from the piano, her composing sheets fall and scatter all over the floor, and by the piano. In the next shot the sheets are now suddenly all close to her so that she can pick them all up in this shot.
Continuity mistake: When Troy and Gabriella are singing "Start of Something New" Gabriella's left sleeve moves up and down between shots during the scene.
Continuity mistake: When Gabriella is shown Troy on the laptop, dismissing the musical, she begins to cry. She still has wet tear streaks on her face as she looks out the window, but as "When There Was Me and You" begins, her face is dry.
Continuity mistake: When Troy and Gabriella exchange numbers, Troy uses Gabriella's phone to take a photo of himself, but he doesn't press enough, if any buttons to put his number in.
Continuity mistake: The post-callback basketball scene's countdown clock isn't accurate. If you try counting with it, you'll notice that it reaches 0 by the time that the ball's being passed to Troy.
Continuity mistake: When everybody is exiting Ms. Darbus' classroom after the first day back, as Troy and Gabriella talk in the hallway, some of the same people are seen walking out of the classroom twice.
Continuity mistake: When everyone is in home room and they are getting their phones taken away, Troy is shutting his phone in a close up, and then when they show the whole class, his phone is open again.
Continuity mistake: Troy and other members of the basketball team say that the big basketball game is in 2 weeks, and the scholastic decathlon members say that their championship is in 1 week, but near the end of the movie their championships are on the same day. We know Sharpay couldn't have changed it because all she asked to be changed was the call back date.
Continuity mistake: In the song 'Breaking Free,' Troy's microphone constantly jumps from one hand to the other as the shot changes but too quickly for it to be because he moved it.
Continuity mistake: When Sharpay gets french fries dumped on her shirt, her white under shirt has nacho cheese all over it. But in the next scene when she talks to Zeke, her under shirt is clean again.
Continuity mistake: Troy is running down the stairs to get to the audition, his boxers are blue. However when he says " I'll sing with her", his boxers are now white.
Continuity mistake: Near the end, at the end of "Breaking Free" , Gabriella has the mic in one hand, but in the next shot it's in the other hand.
Continuity mistake: Just as Miss Darbus walks onto the stage to announce the auditions have begun, Troy quickly hides behind the curtain. However, when they cut to a farther back view, the curtains aren't moving.
Continuity mistake: In the scene at the beginning when Troy and Gabriella sing "Start Of Something New", Troy takes the mic off the stand. Moments later, at a different angle the mic is back on, then off, then back on.
Continuity mistake: In the locker room, the coach's sandwich goes from his hand to the desk to his hand and switches hands a few times in this scene. It also appears to get bigger and smaller a few times.
Answer: I'm not positive, but that is what I've always assumed.