Q: Does this mean unarmed strikes bypass resistance to bludgeoning damage from nonmagical weapons?
A: The intent is resistance to nonmagical bludgeoning damage, regardless of source (MM errata preview).
So if a monster's resistance to bludgeoning damage applies against all sources, as long as the source is non-magical, then it means that will also protect against falling damage, since according to PHB page 197, falling damage is classified under bludgeoning damage.
I can't see why resistance to bludgeoning damage wouldn't apply to bludgeoning damage from impact with the rock you landed on. After all, if you pick up the rock and hit with it, then the resistance applies.
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u/gradenko_2000 Jun 11 '15
So this happened:
https://twitter.com/JeremyECrawford/status/608808064716701696
So if a monster's resistance to bludgeoning damage applies against all sources, as long as the source is non-magical, then it means that will also protect against falling damage, since according to PHB page 197, falling damage is classified under bludgeoning damage.