 The scene with Mike and Trent talking in the car on the side of the  road was also filmed without a permit (not only could the production  not afford one, it is actually impossible for any film production to  acquire one to film on that particular highway). Originally they had  planned to film just an establishing shot of the two of them in the  car, and a shot of them driving away, and then film the dialog shots  later. But director Doug Liman (qv) decided instead to film the  entire scene on the actual side of the road. During filming, several  police showed up, and demanded to see a permit. The assistant  director held up the police by telling them that they had a permit,  but it was in the office across town, several miles away. To get  away with the rest of the scene being filmed, Liman had to pretend  he was not filming, and didnt look in the viewfinder, and used a  microphone inside of the car instead of a boom. Most of the scene  was filmed like this, with the police waiting just out of shot, and  the two actors and the director pretending they were in fact not  shooting.