Guard at Liberty Gate: What were you doing out there?
Staff Sergeant William James: Visiting a whorehouse.
Guard at Liberty Gate: Okay. If I let you back in, will you tell me where it is exactly?
In one scene they are playing on an Xbox 360, but the Xbox 360 did not come out until 2005, and the game being played, Gears of War, wasn't released until 2006. The movie takes place in 2004.