Other mistake: After Langdon saves the last of the Preferati by diving into the fountain, he heads off to St. Angelo with dry clothes. Since it is only ten or fifteen minutes later, his clothes should be soaked.
Carlo Ventresca: Our church is at war. We are under attack from an old enemy. The Illuminati. They have struck us from within and threatening us all with destruction from their new god's signs.
Question: What is the purpose of the boots on the rafters in the scene where they find the first murdered priest?