I didn't hear a thing. The keynote and/or lightning talks that were happening during this were pretty loud, and I was paying attention to those (although it certainly doesn't look it from this snap, heh).
Yeah, maybe it's because I'm hard of hearing, but I find that I never hear inside-voice comments from the audience when I'm listening to a presentation. I actually have some pity for those whose hearing is so acute that they suffer from such distractions.