Ripplin said:

Just a by-product of the voice modulating technology they used after Jones did his lines, I suspect. It probably does it all the time, but in normal speech, we don't hear it so much. Slow and stretched out like that, you hear the warbling of the technology more.

Just a guess, of course.

well, I noticed it watching the movie, and went to the soundboards to confirm it. Know it's not a big deal, but in my case, it made my doubt during my early days of studying english, whether the word for Spanish "destino" was destiny, or destinity (?); so let's say it's a personal thing with that line.