Ziva asks why her ball cap has a 9mm hole in it. It has two. The cap she is wearing is the one Tony shot in Marine Down (2003) and then gave to Kate.
He actually gave it to Abby, after she said "whoa, cool, where can I get one of these?!" and he told her to have that one.
Rule #9: "Never go anywhere without a knife."
Gibbs allows Ziva to keep her knife. Later demonstrated to be a good rule to follow.
Gibbs allows Ziva to keep her knife. Later demonstrated to be a good rule to follow.
Gibb's rule no. 18: It's better to seek forgiveness than ask permission.
Tony lists his areas of homicide expertise: Multiple Homicides; Gang Related; Defenestration. Defenestration is the act of throwing someone or something out of a window.
The sketches Ziva gives Gibbs at the end of the episode were alluded to in the last season's finale. Kate is seen placing the finishing touches on the sketch of DiNozzo at the beginning of the episode, before McGee notices what she's doing and she quickly hides it.