See! I watch on my computer with headphones so maybe that's why I can pick it out easier, if I watched on my TV with TV's crappy speakers and room acoustics it might be harder to hear.
I used to run a sound board for a band as well and had some training on listening to voices and instruments and equalizing and balancing things to compensate for a room or equipment, so I might just be super picky with this kind of stuff too.
https://www.youtube.com/watch?v=TxTbLcCIJxo
If you play that video then play the part where Malory is talking to Lana it's super clear (I can't find a video of that online). It's almost like she's talking in her falsetto register instead of her modal register (
http://en.wikipedia.org/wiki/Vocal_register for anyone who's done vocal training).