How (Not) To Be a Pharisee!

Christ startled His disciples when He declared to them that they would not inherit the Kingdom of God if their righteousness was not to exceed the righteousness of the Pharisees.  The Pharisees were considered to be extremely righteous and law-abiding religious leaders, so how could anyone exceed their righteousness and their zeal for the law? What were the fundamental character flaws of the Pharisees? And how can we make sure that we do not fall into the same trap?