Helicopter in the middle of a series of crop circles – awesome! Not surprising that Abby got so obsessed, it's just the kind of thing that she would love. Very fun side storyline.
Very interesting story with the clan feud, the conspiracy and the rogue marine using his training to get revenge. It was smart of Gibbs to appeal to his sense of family – his niece or nephew – since the family issue is what started the sequence events which led to murder.
It was sweet of Tony to get flowers for Kate and despite the invasion of privacy, it was the thought that counts.