“I’m still trying to understand what’s going on. It keeps saying it is a true story like the movie but it’s so different than the movie.”
Just so you know, the movie’s claim to be based on a true story was a hoax. The TV series is playing along with that same hoax....
From Wiki:
Although the film plot is completely fictional, the Coen brothers claim that many of the events that take place in the movie were actually based on true events from other cases that they threw together to make one story.