When Ducky comes out of the lab into the hallway and takes a left. Gibbs comes around the corner from down the hallway-behind Ducky and says "Hey." However, he says this before he could have seen Ducky. Ducky responded to the "Hey" and turned to meet Gibbs. The voice does not sound like Gibbs, nor is "Hey" something his character would normally say. The assumption is that this may have been inserted in editing by someone else doing the voice over.
In the final confrontation in front of Angela's house, the bad guy is using little Angela as a human shield. Ziva has her handgun trained on him. He says to Gibbs, "She'll miss." Gibbs looks at Angela and asks her "What are the odds of that?" Angela calculates and says "97%." Now, Angela has just said that Ziva has a 97% chance of MISSING. Fortunately, Ziva does not miss.