When the move was being made, Tom Noonan asked that nobody saw him. Those people who could saw him called him "Francis", because he pretended to be his character the whole time. This made the other actors afraid of him. The first time Noonan met William Petersen was when Petersen jumped through a large window while making the last part of the movie. At first, actor Tom Noonan wore a fake tattoo of a dragon on his chest. The parts of the movie that showed this were made again without the tattoo. This is because Michael Mann and Tom Noonan thought it did not look right.