The Truth Is Out There - S1-E17
Revealing mistake: Gibbs finds a bunch of cash hidden in the victim's speaker. "For Motion Picture Use Only" is printed on them.
Revealing mistake: When DiNozzo is watching the ship through the binoculars at the beginning, the film is run in reverse. The sailor smoking on the deck is the giveaway, as the smoke he's blowing is going into his mouth. (00:00:15)
Once a Hero - S4-E8
Revealing mistake: When Ducky opens the fridge door containing the suspected killer, the dead body's eye twitches. (00:21:00)
Revealing mistake: When Gibbs' flip phone started ringing, and he flipped it open to answer it, for the brief second, in the closeup shot of the flip phone, the screen on the phone says "No Service" despite receiving an incoming call.
Revealing mistake: When SecNav is walking down the hallway to find Cobb, a camera man's shadow is on the left-hand wall briefly. (00:32:10)
Revealing mistake: When crossing the street the victim puts her hands on the hood of the car. If you look closely you will see the hood has prints on it from multiple takes. (00:00:15)
Revealing mistake: Right at the start, in the tight closeup just as Sweeney squeezes the trigger, "Replica Independent Studio Services Sunland, CA" can be seen engraved on the prop weapon. ISS is a supplier of props for production studios. (00:00:10)
Revealing mistake: When Abby and Palmer tell Gibbs about General Gadet, Palmer notes that Ellie has been trying to find his last location, and Ellie replies, "Which I think I have and something more." Then Ellie walks over to Gibbs with her laptop to show him the NSA intel report about General Gadet. The problem is the first sentence of the NSA report reads, "Which I think I have and something more," which was Ellie's reply in the dialogue, and a few lines down are three paragraphs of nonsensical filler text. (00:31:00)
Revealing mistake: While Ellie and George are in the attic, Ellie uses her laptop to access contact info and gets Richard Doogan's DOD military service record. There's a closeup of the laptop screen as she begins to read aloud, but the problem is part of the paragraph reads, "And he's only a few hours away in Kansas..." and especially "I need to update Gibbs" which are Ellie's lines in the dialogue with her brother. (00:16:45)
Mind Games - S3-E3
Revealing mistake: When O'Neill starts taking Polaroid photos of Cassidy in the barn, Cassidy's blouse is properly buttoned up, but the second photo O'Neill takes shows Cassidy's blouse is being held together with a large safety pin, then the buttons are intact again. (00:39:10)
Jack Knife - S7-E15
Revealing mistake: When Gibbs' car does the quick 180 to return to the gas station, It's not Fornell or Gibbs driving. (00:27:20)
Revealing mistake: At the end Gibbs puts the handcuffs on the bad guy and they walk off. However look carefully to see the bad guy is just holding the cuffs and they're not applied. (00:40:05)
Revealing mistake: When Ziva wakes up and has the sheet stuck to her face, Tony pulls it off. When he does you can see the glue patch on the page used to stick it to Ziva's face. (00:02:00)
Revealing mistake: At the crime scene we see Gibbs making notes on his notepad prior to Ducky calling him over. When he's looking at the business card you can see his notes in his notepad. However his notes are all just random lines and squiggles. It's not the case that he's made notes for himself in his own writing style. (00:04:00)
Agent Afloat - S6-E2
Revealing mistake: When the officers wife is found dead at the start, look at her chest to see her still breathing. (00:03:20)
Revealing mistake: We see a close up of the money in the truck and the $100 note has got "This bill is for motion picture use only" printed on it. (00:05:40)
Revealing mistake: Agent Lang takes a picture of a debit card inside the first victims car which is a clearly prop. The name is "Jane Doe", and the card number is 1234-5678-9101-1112. (00:05:40)
Revealing mistake: When Tony takes the book off Ziva, look at the cover. It's upside down. (00:10:20)
Chosen answer: "Policing your brass", means to pick up your expended shell casings, after firing your rifle, or pistol.