(at around 32 mins) for the first time in NCIS history, is seen Special Agent Gibbs doing his now famous trademark action "Smack DiNozzo upside the Head". Not originally written in the script, this action was improvised by Mark Harmon on the spot, during the shooting of the scene. It has become over the years an ongoing gag.
This storyline was inspired by the case of Andy Muns, Disbursement Officer of the USS Cacaphon, who mysteriously disappeared before
Morning Muster, near Subic Bay Naval Base, Philippines in 1968 during the Vietnam War. It was one of the oldest cases resolved by NCIS Cold Case Unit.
It's revealed that Tony has been an NCIS Special Agent and a member of the main NCIS Major Case Response Team for two years.
It's revealed that a month has passed since Kate became an NCIS Special Agent.