While in the lab when Gibbs has told Tony to find the female in the photo, as Gibbs is leaving, Ducky is approaching from another room and calls out to Gibbs and is clearly heard. Ducky is across the room and the sliding glass door is closed, so his voice would not have carried through. The door opens when Abby and Ducky walk through from different sides and a beeping is heard as it opens.
While the team are waiting for Lieutenant Egan to leave her house, Abby and her NASA friend are monitoring via satellite. Satellites cannot just hover over Washington DC waiting for something to happen. That's not how low Earth orbits work.
When Dinozzo sees Gina in the base gym, he introduces himself as "Anthony Dinozzo". Then to confirm it, he gets his credentials. He signed his ID as "A. Dinozzo". After looking at it, she calls him "Tony". He gave her no indication that he goes by the nickname Tony.
When Gibbs is interviewing the dead victim's wife for the second time at her residence, the camera pans from left to right, perpendicular to her left side at a distance of about 20 feet. Light from a window behind the camera is reflected onto a CRT TV, and a crew member is silhouetted against this window.