Jett, who is portrayed in the film by actress Kristen Stewart, said the new film should also serve as an introduction to the 1970s rock and roll band to many viewers, the New York Daily News said Saturday.
"A lot of people are not even aware of the Runaways," Jett said of the all-girl teenage band. "This will introduce them. They can go back to the music and hear for themselves."
While Jett applauded Stewart's dedication to learning the best way to portray her in the film, she did mention a mild concern regarding parts of the film.
"Well, it's a movie, so it's never exactly right. They have to set up a bad guy and a good guy, a winner and loser," Jett told the Daily News.
The film from director Floria Sigismondi is based on memoir "Neon Angel" by Runaways singer Cherie Currie.