When Agent Callen and Agent Gibbs are talking at the beach, Gibbs mentions that it is 10:00 in the morning, which is why they are not drinking at a bar, but the sun is setting over the ocean, meaning that it is late afternoon on the West Coast.
When the NCIS team arrive at the electrocuted victim's body, they are in an under-construction building that overlooks the Potomac River, next to the George Washington Parkway, and just south of the east/west line that runs through the US Capitol and the Washington Monument (as deduced from the background). This would place the building in the same location of Netherlands Carillon, which is located at N Marshall Dr (adjacent to Arlington National Cemetery).
The dead Marine's fictional boarding pass names the carrier as the Transcon Airlines; however, it also states the flight number as DL-324, in which the prefix DL indicates the real Delta Airlines, not the fictional Transcon Airlines. Furthermore, the correct IATA airport code of Los Angeles is LAX.