When Tim is in the basement with Gibbs confronting him about his relationship with the victim, Gibbs is "steaming" wood for his boat. In the wide shot, "steam" is seen sinking from the steam-box and settling near the floor. Steam would rise from the steam-box; dry-ice vapor sinks and spreads-out across horizontal surfaces.
The team is called to investigate a body in Arlington. When they discover the victim was reported killed at the Pentagon on 9/11, they wonder how her body ended up twelve miles away. The Pentagon is located in Arlington County, which is only 26 square miles - any place twelve miles away would be outside Arlington.
125 people were killed in the 9/11 attack on the Pentagon. It makes absolutely no sense that a single Major was picked out for a news report when higher-ranking and more important officials were likely killed, as well.