The High School, and ice rinks shown in the film were the same ones Carley herself used to attend and skate at.
The song that Carley performs on a piano is Human, originally by Christina Perri. That worldwide hit, with over 100,000,000 views on YouTube, was covered by the real Carley Allison after her tracheostomy tube was removed, and can also be found on YouTube. It's a beautiful and chilling rendition of the song.
The house that Sarah Fisher played Carley Allison in was actually Carley Allison's bedroom in real life. It was her real bedroom and everything.