Revealing mistake: At the start, when the brain is being passed around you can see a fixed tube connecting to the student's arm to presumably pump the mercury into his hand. (00:01:20)
Visible crew/equipment: When Tony is pacing after they find out Kamal's identity, there is a green tape marker visible on the floor. (00:32:00)
Visible crew/equipment: Just as the blonde asks if she's needed to ID another photo, there is an overhead shot that includes the camera trolley wheel. (00:35:20)
Visible crew/equipment: When Ducky comes in explaining how the victim has one more thing to say, a red tape marker is visible on the floor. (00:37:05)
Continuity mistake: 5-4: Identity Crisis. When Ziva is speaking with McGee her lapel changes from being turned up and laying down.
Chosen answer: "Policing your brass", means to pick up your expended shell casings, after firing your rifle, or pistol.
pross79