When I was a child, there was always some candy I didn't like. That stuff would be left in my pumpkin for months, and my mother would end up feeding it to the dog in February.
My daughter still has some of hers left. She's picky, too (doesn't like nuts, for example), so she has some good things left, like Snickers bars. My husband loves those but was recently warned he was borderline diabetic, so he's afraid to eat them. I'm sure one of my sons or I will end up eating whatever is good like that. But there will be some things we won't eat, Tootsie rolls and stuff like that.
We also usually find a stray piece of hard candy in the bottom of one of the pumpkins from the previous year. I always have to wash them out before they can be used again.