Bobby explains everything at the barbecue about Parmalee being a fraud and that he was actually someone else that was with Jock and heard Jock's stories while he was Ill with the fever. However, no explanation is ever provided as to how Parmalee had the same injuries that Jock did as no con man would ever be able to pull off something like this. No one person in the world could have the same identical x-rays as another person that they were trying to impersonate either.