We can distinguish fact from fiction in 'Walk the Line' by considering the overall arc of Johnny Cash's real - life story. His well - known struggles with addiction and his relationship with June Carter are real aspects of his life. So, if there are parts in the movie that seem to deviate too much from the general understanding of these key elements, they are probably fictional. Also, if a scene seems too good to be true in terms of how it portrays a relationship or an event, it might be a fictional addition for the sake of the movie's drama.
Look at the historical records. If something in the movie doesn't match what the real - life records say about Johnny Cash, it's likely fiction. For example, if the movie shows a performance at a place where he never actually performed, that's fiction.
To distinguish fact from fiction in 'Walk the Line', we need to do some research on Johnny Cash. His real musical career milestones, like his hit songs and his album releases, are facts. In the movie, if there are events that seem to be added just to make the story more exciting, like a fictional encounter with a record executive that never actually happened in real life, that's clearly a fictional element. Also, his real family background and upbringing are facts, and any major deviations from that in the movie would be fictional.