Factual error: There is no way Josie could have heard Alan M at the concert. First of all, she has a headphone in her ear, so she can hear herself sing, and second, the crowd is so loud, it's hard to hear people in the front row, never mind several rows back where Alan M was bodysurfing.
Factual error: In 1983, Billie covers "I Didn't Mean To Turn You On" which was not released until 1984. (00:22:50)
Factual error: During the first scenes of the film the Greek flag used is the current one, and not the one used at that time. The flag that should have been used is a white cross on blue.
Factual error: In the opening credits, a new model Chevy S-10 is shown. That body style wasn't out till the mid 90's.
Factual error: It's established that the kids live in and go to school on the South Side (south of the Loop), and much is made of the fact that Malakai has nothing but his "respect" within his neighbourhood. At the movie's end, where Malakai wants Derek to accompany him on the robbery/murder, he tells Derek, "Meet me at 47th street, under the El." Yet when Derek runs off and jumps on the train to go meet Sara, we see him getting on a Brown Line train - those trains can only be found on the North side, miles and miles away from 47th street. In addition, his train is shown heading SOUTH toward the Loop, which means in order to be going that direction on that train he'd have rode on the train for about an hour, past the Loop entirely, then gotten off and turned back around toward the Loop again.
Factual error: Just before the band records their first EP Ride Into The Sun, the drummer quits. Rick Allen is shown to audition, is hired, then plays on the recording. In reality, Rick was hired after the recording of the EP. For the recording of the EP, Def Leppard recruited Frank Noon of The Next Band to play the drums.