Pedro Almodóvar was several times approached to helm this project and seriously considered to make it his first English-speaking feature. He finally declined but, allegedly, he participated in early versions of the script.
At the beginning of the movie, at about 7:20; the gal with the brown and white stripped shirt, sitting down on the couch, closes her legs when the camera pans on her. This seems to be a reaction to the camera as opposed to a script.
In the beginning of the movie, 3:36-3:37, Zac Efron seems to have a similar jump, when jumping off the pick up truck, as he did in High School Musical 2. This can be compared to the scene when he jumps off the cliff, in one of his scenes, in the single, "Bet On It"