Factual error: When Johnny commits suicide in the end, the slide of the pistol doesn't move when it fires. (01:33:00)
Factual error: The way Johnny records the phone-calls makes no sense whatsoever. He plugs in an old cassette-tape player/recorder to his phone, puts a single tape in, yet we're expected to believe it is always recording, and never fills up. Tapes don't last long enough for him to record days of audio, nor will lazily "plugging it in" to the phone record all of the phonecalls.