So: how many calories are in one bag of popped popcorn?
First off: One serving, unpopped, is 35g. They're claiming that the entire bag is about 3 servings, and that works out - 105g is close to 99g. I can buy that.
The next line reads "(makes 4.5 cups popped)".
Now, if we assume that's per serving, that means we end up with a truly phenomenal 13.5 cups of popcorn out of one bag. Which seems unlikely. So let's assume that means per bag.
But then after that, we see that a "serving" of popcorn is 1 cup. And if our bag contains 3 servings, that means we have 3 cups of popcorn, not 4.5 cups!
I think I've finally worked out the answer here. One serving *unpopped* turns into 1.5 servings when you pop it. And that's why everything's so painfully inconsistent.
I mean, duh. Why didn't I think of that before?