Yes, 'The Crowded Room' is based on a true story. It's inspired by the life of Billy Milligan, who was the first person to use multiple personality disorder as a legal defense in the United States.
Most likely not. Usually, if it were based on a true story, there would be clear indications or publicity about it. But for 'Crowded Room', there's no such information suggesting it's true.
Not entirely. While it may draw some inspiration from real-life situations, it's largely a fictional creation with added dramatic elements for entertainment purposes.