I am so happy I read this thread! And I just finished watching the movie (on Amazon Prime).
The movie captured the teenage JW experience very well. There were only 3 VERY minor nuances that were slightly off: The Uncle saying he would never be a 'good Jehovah' (and the main character repeating the same phrase) and someone saying 'at Kingdom Hall' instead of 'at *the* Kingdom Hall. I can't remember the 3rd, but likewise very minor.
It's hard to believe this movie did not get more coverage here on JWN. Searching this site, I found a few threads about the book from 7-8 years ago but they did not get many comments, either.
This is probably because is uses the term 'Jesus Freak' in the title and XJWs have enough issues of their own with little-to-no-room for Jesus Freak issues.
But this movie is ALL JW.
Well worth the hour and half viewing time. But beware, it may trigger a few emotions.