In September 1984, the Bulls signed MJ to a 7-year deal for only $6.15 million. That's unreal compared to the money NBA players are getting today.
In May 1995 against the Orlando Magic, MJ decided to stop wearing the #45 and go back to the #23. Click here to watch highlights of that game on YouTube. If you look closely you'll see that MJ was the only Bull with white shoes on. The NBA considered that a uniform violation and fined him for not wearing black shoes like the rest of his teammates.