It’s marked the first time appearance of Kelly Gibbs
Trivia
Gibbs mentions to Zach that he'd "knock that wall out and hoist his boat up" to get it out of the basement. This is exactly how we see him get his boat out in The Great Wide Open.
When the Jenny Shepard complimented Gibbs on his way with children, she then asked if he'd ever considered having one of his own. He smiled and dismissed the question with a joke: "Are you offering, Jen?" When, at the end of episode, his memory of Zach blurs over into a memory of his daughter Kelly, who the viewers see for the first time here and they are alerted to the fact that he's never told anyone in his team (up to this point of the story) about his family.