Yeah it's at a scene change (still at the platform, but with different video quality. I don't recall the original version here, but it appears this second part of the scene wasn't a deleted one). I checked it out again, and it isn't really a glitch, just a noticable change of audio quality. It was a lot more noticable when using headphones than speakers.

And do you have an alternate suggestion for the subtitle? "Settle down, settle down" is lame.

I don't have any specific suggestions, but at least something along the lines of "settle down" gets the point across without actually calling his subjects unbelievers for mysterious reasons.