Elmofongo: It had hard moments like trying to kill that one guy on the roof top with badguys surrounding you and if you don't act quick they will blow you away.
Now I am perplexed. What "guy on the roof top"? What you describe does not sound anything like the "Keep your friends close..." that I just played earlier today. This is how the mission went for me:
I was at my mansion, and the boss (Sonny?) for which you were sent to jail comes to talk to you. Apparently you are giving him some fake money in a briefcase, 3 million dollars, but he refuses. You learn that the black guy (Lance?) you thought was your friend had sold you out. After that the action starts:
I stand in front of my office on the second floor inside the mansion. A couple of guys run in through the front door, shooting at me. I shoot them with my heavy machine gun. More enemies come through the main door and some from the second floor side doors, I shoot them too.
At some point the traitor (Lance?) comes through the side door I think, spewing some shit. So I shoot him down too. More enemies pour in, I shoot them down effortlessly.
Eventually the main guy (Sonny?) comes through the front door threatening to kill me or worse, and two of his henchmen. Again, I just shoot them down. After that I get a non-interactive part where the lawyer (Ken Rosenberg) keeps asking me what has happened etc., and the end credits roll.
Was I supposed to do something else, or wasn't that the last mission after all? I did get the end credits after that, after which the game still continued and I kept getting funny phone calls from others, but no more missions. As I said, I basically just stood in front of my office door, and shot anything that moved. All the action happened inside the mansion.