Leonardo said:

Don't know why I didn't think of that.

"er, um, interesting fact about star destroyers, there, norm..."

JEDIT: apparently he wasn't overdubbed, according to some youtube commenters here http://www.youtube.com/watch?v=Jt28gOnYz94 and listening a few times in a row, that could very well be the case.

Never trust anyone on Youtube. ;)

I suppose he could be good with doing other voices, as he's been in all those Pixar movies. The other scene where he tells the pilots "Let's go!" sounds like his normal speaking voice though.