"When Paul reached the steps, the violence of the mob was so great he had to be carried by the soldiers. The crowd that followed kept shouting, 'Away with him!'" NIV translation
The mob wasn't happy with just having Paul arrested as they even followed as he was being taken away. This reminds me of the times that we live in and the misguided religious fervor that is often seen. A simple comment or picture of Muhammad can start the same type of mob reaction around the world. The sad fact is that religious fervor does not get you any closer to God or heaven.
"As the soldiers were about to take Paul into the barracks, he asked the commander, 'May I say something to you?' 'Do you speak Greek?' he replied. 'Aren't you the Egyptian who started a revolt and led four thousand terrorists out into the desert some time ago?'" NIV translation
As Paul was being taken into the barracks, he spoke to the commander in Greek which surprised the commander. The commander did not know Paul and did not recognize him but instead thought he was a common criminal. This speaks much about Paul and his ministry in that it was all about Jesus and not self promotion.
Today, there are many that are peddling the gospel for fame and profit but Paul was simply led by the Holy Spirit and shared the gospel.
"Paul answered, 'I am a Jew, from Tarsus in Cilicia, a citizen of no ordinary city. Please let me speak to the people.' Having received the commander's permission, Paul stood on the steps and motioned to the crowd. When they were all silent, he said to them in Aramaic:" NIV translation
After Paul cleared up the case of mistaken identity, he received permission to speak to the crowd. He had spoken in Greek to the commander but switches to Aramaic to speak to the Jewish people.