Factual error: Billy Bob Thornton is new at the air traffic facility, yet he plugs in and immediately begins working airplanes. Under no circumstances would he be able to do that without having someone train him first (even if he was a controller at that facility at a prior time). Each facility has its own approaches, restrictions, etc.
Factual error: When Nick returns as a controller, he is working traffic and a conflict alarm for two aircraft on the same trajectory sounds that indicates a mid-air collision is imminent. Another controller has to jump in and order the two aircraft to change headings to avoid a crash. In the following shot, it shows the two aircraft nearly collide and the pilots look shocked. However, all aircraft have a system called TCAS or the Traffic Collision Avoidance System which notifies pilots of an incoming conflict with another aircraft. It then orders a resolution advisory such as an emergency descent or climb. Therefore, commercial pilots would have neither been unprepared for this event, nor surprised.