Trivia: After the credits, there is an enjoyable one minute scene with Sharpay and Zeke.
Trivia: One of the basketball players (number 44) choreographed all the dances.
Trivia: In the cafeteria, all the milk cartons had a lemon and lime drink in them. The reason for this is that if they were filled with real milk, it would have turned sour during filming.
Trivia: In the scene Mrs. Darbus is introduced into the movie, Troy was talking about "pink jelly". At that point, he was told to make anything up in those few seconds.
Trivia: In this film (unlike HSM2), Zac Efron's (Troy) singing voice is actually Andrew Seeley's singing. It is Seeley who sings "Get'cha Head in the Game" in its entirety and the reprise of "What I've Been Looking For." The only parts that are actually Zac's vocals are: the first four lines of "Start of Something New," the singing on Gabriella's balcony, and the very first sentence of "Breaking Free." The producers wanted a tenor, which Zac is not.