I’ve seen dead insects printed in books and other unidentifiable splodges. Here from The Collation is a picture of a piece of type which has fallen across the type page and been printed — in 1609.

STC 7470 copy 2. The groove is at the bottom of the foot of the type (upper left in the image), the nick on the side. Photograph by Caroline Duroselle-Melish.

Anything which falls onto the type, or in the case of offset lithography onto the plate or the blanket, can remain in place, pick up ink, and be immortalized in print. The press-minder is meant to notice this sort of thing, but even they are just human. Once they do discover such an error they are meant to discard the last few sheets printed on the assumption that several faulty impressions will have happened before they noticed, but sometimes they take out too few sheets.

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