I think if it was frass (the technical term for insect poop) it would probably be very soft and water-soaked after cooking and probably wouldn't stick to the kernels.
Are the ends of the ears open with the husks pulled away a little bit?
I think with you being in Nebraska, your county extension agent probably
knows a fair bit about corn and it wouldn't be too hard to get an answer from
them about it.
I am no expert and I don't stay at Holiday Inns but Is it possible that your
ears simply did not fill out all the way.
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