Continuity mistake: In the scene where Tony and Ziva discover the dead body in Amanda's hiding place the dead body's extended arm is lying on the rug on the floor, and is left that way when Gibbs tell them to leave, yet in the next scene when Ducky shows Gibbs a picture of the dead body, the rug beneath the extended arm has disappeared.
Continuity mistake: During the investigation of the dead wife's crime scene, the arms of the corpse change position from shot to shot throughout the scene, including a moment where the corpse's arms are crossed, then in the next shot Ducky is shown crossing her arms. Ducky is also shown crossing the same arm twice, and the guitar control also changes direction and position with respect to the body.
Continuity mistake: Episode "Heartland": In the first five minutes of the show, after the guys are beaten up in the alley, when the black guy is laid down on the ground there is a blood stain on the wall, behind where he was standing. When the other guys go to the white guy's aid the blood stain is gone, for about 3-4 shots. When the NCIS team is there gathering evidence the blood is back on the wall.