While G and Sam chat at the site of the shooting of Daniel, the two of them talk about speeds and speed limits at marinas generally and the nearby marina in particular; they speak in terms of "miles per hour"; in the context of maritime activities, however, even among civilians and small vessels, the correct term is instead "knots" (which means nautical miles per hour). [Eight m.p.h. equals about seven knots.]
In Abby's scenes, she repeatedly refers to Director Vance by his first name, Leon. As she never does this on NCIS, it makes no sense that she would randomly and temporarily start calling him Leon.