The "bugs" are the same fault as fisheyes, just caused by more irregular debris. Stuff stuck to the offset blanket get's inked, but causes a dent in the rubber so the area around it doesn't get inked.
If there's a background color like on Killebrew, it shows. Fairly often yellow is left under Magenta to make a nice red.
The one on Brandt is less typical, both for size, and because it doesn't have much of a center. There was probably a larger bit of debris at one time that fell off, but damaged the blanket. Since leaving yellow under the blue would make the card green, there's no background color.
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