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When displaying a page, if we hit an error, what should we do?
We could choose to stop interpretation entirely, but that would mean that a relatively unimportant error (such as a missing or broken font) would prevent us getting anything useful out of a page.
We could choose to ignore the errors and continue, but that would be a problem for (say) a print run, where it would undesirable for us to print 1000 copies of a document only to discover that it's missing an image.
The strategy taken by MuPDF is to swallow errors during interpretation, but keep a count of them in the errors field within the cookie. That way callers can check that cookie.errors == 0 at the end to know whether a run completed without incident.