Popcorn with truffle oil/salt
Most molds are harmless, especially if you heated it properly which you should have had done when you popped the kernels. Don't worry and relax first of all. If you do feel sick or if it would put you at ease then go see a medical professional and explain what happened. But overall you should be fine.

P.S. Oils like truffle oil lose their scent, aroma and overall taste when heated too high so most things like truffle popcorn go to waste; just get truffle oil and add it to popped popcorn. Be sure to see that the oil is mainly truffle. (most truffle oils have lots of additives.)

If you meant pre-popped...
Again, most molds are fine and it's good that you threw away any odd bits.