I so didn't get the point of Talia being in episode 23. Seriously, if she is going to be on, she needed to be at the wedding and causing a little Kensi/Deeks stress, not rocking up at the boat shed, talking with Callen and Sam, then leaving and having nothing really to do with the plot. It seemed like it was filling in. I really liked the Talia character, but her appearing was redundant, the storyline didn't go back to her.
I kind of get the use of Sabatino, he is always getting in the way or has some finger in the pie when it comes to things the NCIS LA agents do. and seeing him is ok.
The Harm and Mac bit, also a little redundant, they just pissed off the old JAG fans by not having them together as a couple, and because they were guest stars and it was only a supporting role, JAG fans were even more disappointed with the outcome. I am thinking it could have been any ship, with any XO and CO, and Harm being there and Mac being Hetty's secret weapon against the Russian diplomat really could have been anyone.