I think Keppler and Catherine may have had a mutual crush-thing going. He made some flirtatious comment to her in his first episode--I can't remember exactly what it was. Then in this episode, she did try to convince Keppler to think about joining the night shift instead of days. She started getting upset when he sounded suicidal over the phone--that likely shook her up a lot. Then to find him shot, and see him shoot McCarty in order to protect her, and have him nearly die in her arms. I can see why she'd be upset. As shady as the whole "reverse forensics" deal was, I think the two of them connected during that whole ordeal, and she likely took it upon herself to look out for him.
Loved the scene with Nick and the baby, reminded me of Ryan and the baby in CSI: Miami "Shootout". Didn't think so at the time, but after a couple people mentioned it here I agree the whole butt implant scene should have gone to Greg (not that George didn't do a good job with it--he was cute), but that's such a Greg moment--and since the other Greg moment was given to Hodges, unless whoever wrote the article got Greg and Hodges confused (I don't see how that's possible).
Loved the Sara and Grissom moment. I felt for Grissom, and I was thinking "Sara, all those years you wanted to get a response from Grissom and here it is, and you're running away from it". But, it goes with the cat-and-mouse game that is GSR.