This was the most interesting part
(maybe not for Chargers fans)
Spring, 1998. Manning and Ryan Leaf are projected as the top two picks in the draft. The Chargers, picking second, want to interview both prospects. They send an abbreviated version of their playbook to each and ask them to learn the offense before the interview.
As a reward and a test, the coaches staple a $20 bill to the last page - a clever way to determine if they've read the entire book. Leaf arrives for his interview and never mentions anything about the $20. Clearly, he doesn't know it's there. Manning shows up and immediately thanks the coaches for the $20.
Unfortunately for the Chargers, Manning is picked by the Colts and they settle for Leaf. You know the rest of the story.