Film director Frank Darabont directed an episode for the series. Darabont later reunited with several writers from "The Shield" for his television adaptation of "The Walking Dead" comics, including Charles H. Eglee, Glen Mazzara and Adam Fierro. Acclaimed playwright and film writer and director David Mamet directed an episode of the series. Mamet and Ryan collaborated as executive producers on military thriller "The Unit". Screenwriter Ted Griffin ("Oceans Eleven") wrote a single episode of the show. Griffin later created "Terriers" and was reunited with Shawn Ryan as a fellow executive producer. The series started with real Los Angeles Police Officers as Technical Advisors; Officers Pablo Vitar and Rafael Dagnesses.