#1 mistake Brandon Jennings made was being friends with Joe Budden. If you are going to be a NBA star you can definitely do better than Joe Budden as your "hip hop" buddy. Having Joe Budden as your Hip Hop sidekick just screams out you are destined to be the 9th man on an eight man rotation team.
#2 mistake and this is up for debate, but regardless if Jennings knew he was being taped or not you can't be recorded by a rapper who claim to fame is not his lyrics, but by putting his girl's ass on camera.
*Sidenote* I respect that hustle. Keep yourself in the spotlight anyway you can even if that means exploiting your girlfriend's booty.
#3 mistake you are Brandon Jennings know you role and shut your mouth. You are the dude was so unsure of his draft position that he was scared to sit in the green room. Now you want to be the one running your mouth how you are the greatest thing since Michael Jackson's Thriller (RIP).
Here is a novel idea how about getting out on the court and becoming the best before claiming you are the best. Then you can have your sit down interview with the Joe Budden.
You can read the official transcript of the entire of the conversation here on The Sporting News Baseline Blog by Chris Littman