A hermie will be either "bananas" that usually grow out of the buds themselves and are longer and thinner than a calyx, or male pollen sacs that have tiny stems and then a cluster of little balls.
Pollinated calyxes are just more swollen versions of what you see elsewhere on your buds, and eventually if the seeds mature they may start peeking out before harvest. The only downside to keeping a pollinated plant around if you do not want the seeds is that processing really seeded bud sounds like a bitch and a half.