There are so many possibilities for the 'Bernie Jack Black story'. It could be a story from a local community where Bernie and Jack Black interacted in some way. Maybe it's a story related to a project they worked on, or it could even be a story that started as a joke among friends and then spread. Without more details, it's really difficult to give a definite account.
It's hard to say for sure. Sometimes stories draw elements from reality but are still mostly made up. Without specific information, it's tough to determine if Bernie is based on a true story.
Yes, the 'bernie film' is based on a true story. It often takes real - life events and adapts them into a cinematic narrative, which can be really interesting as it gives us a glimpse into real events through the medium of film.