I can reproduce the issue azreal reported, however, I've a feeling it may be a glitch that I made on the day.
Yeah I can confirm that.
The glitch is due to me accidentally unmuting (the beep!) the livestream of the audio on my laptop (which has a ~10 second delay or something) without headphones plugged in, and then me rapidly realising and stopping it.
The glitch is slightly less notable on the audio the camera took (as opposed to the mics) but is still there none-the-less.
Post-pro is certainly not to blame here, I am, and to be honest, I'm not sure there's much that can be done about it.
I can't reproduce tuoni's issue.
I've not found any sections with issues yet so to the post pro team; cracking good work!