When Fornell shoots the sailor, the sailor falls half onto the road. When NCIS arrive, the body is solely on the pavement (sidewalk).
When Ducky checks the shooter's eyes after he was shot and they are at first discussing motive, he states that the' constriction in his pupils might suggest that he was on some sort of stimulant'. Opiates cause the pupils to constrict stimulants such as amphetamines cause a person's pupils to dilate.
Furthermore, it is questionable whether one's pupils would continue to be affected by drugs in one's bloodstream after the blood supply is stopped-rather, it's more likely that the muscles of the irises would simply relax, rendering the pupils' size the same as they'd have ended up after death regardless the contents of the victim's blood.
When Fornell and Brown shoot each other through the windshield, the bullet pattern on their bodies don't even come close to matching the the bullet patterns in the windshield.
When Chucky and DiNozzo are opening the fish coolers, when McGee opens the second cooler, there is a crew person wearing a blue shirt or hoodie visible on the lower left side of the screen.
Diane gives her login and password to McGee by announcing it in front of the entire team in a bullpen location. Surely, as a federal agent working on identity theft cases, Diane would know that this is, at best, a bad idea. At worst, because it's access information to a federal mainframe, this might be a firing offense or indictable offense.