Gibbs and Fornell are always a fun duo, especially when their love lives come into focus. They're dysfunctional people, perfectly fit for each other, but beneath the humor is a melancholy feeling. Things get weird when their shared ex-wife wants their help finding her current husband. Old feelings are brought back--she having cheated on Fornell, and Gibbs being her Shannon--which probably won't matter in the long run, but add additional information to the characters.
The investigation ends on an ambiguous note, with the "beware the Military-Industrial Complex" line said after it's surmised that someone opposed to the military draw down targeted officials at the football game. Hopefully the investigation will be closed in a future episode and not obliquely referenced in the middle of a random episode.