- A third High School Musical movie, with the working title of High School Musical 3 (2008) has been announced for debut in movie theaters 2008. The original "Haunted High School Musical" idea was replaced according to Ashley Tisdale at the MTV Movie Awards.
- Drew in a rating of 17.6 million viewers on its premiere night, making it the highest Disney Channel Original Movie in history.
This movie is the first Disney Channel Original Movie (DCOM) to have commercials shown on ABC.
- In the scene in the kitchen, when Troy's cell phone rings the tone is "Getcha Head in the Game" from the first movie.
- "and she stepped on the ball." The punch line is a reference to Trading Places (1983) and Auntie Mame (1958)
- Troy Bolton is the only character in the movie to have a solo.
Before filming this movie, Monique Coleman did not know how to swim and was actually afraid of the water. For the scene where her character jumps into the pool, the script was rewritten for her dancing partner Corbin Bleu to jump in with her. She later said in an interview that she received an amazing amount of support from the entire cast and crew.
Miley Cyrus appears in the end scene, singing "All for One", she is wearing a yellow dress and the camera is only on her for a few seconds.
Ryan Evans wore a total of 15 hats during this movie.
In two different scenes, actors deliver the same punchline to a joke
The ring tone on Troy's cell phone is "Get'cha Head In The Game".
Unlike the first film where he was dubbed partially by Andrew Seeley, Zac Efron does all of his own singing in this film.
Sharpay's license plate is Fabulus.
Scenes were originally filmed in Gabriella's bedroom but never made it to the final film cut
At the end of the film, Troy and Gabriella jump into the pool. During filming all the six main characters jumped in. However, only Troy's and Gabriella's jumps made the final film cut.
The coaster of people doing the wave, at the opening scene in "What time is it" was started by the HSM cast/dancers and Kenny Ortega. Since all the cast/dancers were sore from dance rehearsals, they sat in a line on the floor and began to massage each-other. When Kenny saw this, he told them lean to the right (one by one in a wave), and so they did. Then he decided for them to try it standing up, and when they did so, he used it in the movie in during the opening song.