You can probably expect a lot of personal revelations. Since it's his story, there might be details about his upbringing, his dreams and how he pursued them. There could be some humorous elements too if he's known for his humor. Also, insights into his relationships, both personal and professional. It might show how he dealt with setbacks and successes in his life journey.
You can expect to learn about Darrell Hammond. It may include his story from his early life to his current situation.