Congrats on amazing lucid dream!

Dream within dream is just a fancy scene change, but it can trigger lucidity if you for example read about WILDing and do WILD in dream(doesn't counts as WILD though), and those can be pretty trippy, haha.

About sound, maybe you don't pay much attention to sound in waking life? Either that or maybe it was just random element of dream like that, next time you can try expecting sound to be there or maybe you can summon sound switch to turn the volume up.

As for remembering what DCs say, again, you can try remembering what people say in waking life and it should make it easier, i have same problem here.
*Moved to Lucid Experiences*
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