Changes!
The pilot for NCIS aired as a two-part episode of JAG back in 2003. From there, two huge changes took place. Including a gimmick where Ducky actually talks to corpses, but from the point of view of the corpse. Yeah, that would have been weird. Lastly the role of Viv Blackadder, played by Robyn Lively, was replaced by Sasha Alexander’s character.
Donald Duck
Jut how did “Ducky” get his name? David McCallum plays Donald Mallard, but you knew that already. However, did you know that Mallard is actually a breed of duck? See, it all makes sense now. It’s as simple as that.