I've spent over thirty years in printing and publishing and I've worked with some of the best copy editors, content editors, proofreaders, and writers in the business using the best composition and page make up equipment available, the best printing facilities, the most skilled operators.

Misspellings happen. Typos happen. Wrong words happen. Bad grammar happens. Images are flopped, printed out of register, or under inked, folds and trims are out of square. The list is endless. Usually the equipment doesn't screw up but if if it does and you're lucky enough to find out how, sometimes you can fix it it in time. But the overriding Murphy's law of publishing first puts errors in front of the eyes of the people most likely to be most annoyed by them, usually the person who paid for the publishing or who represents the publisher. This usually happens after distribution has been fulfilled.

Error remedies are part of any publishing or printing budget. All proofing procedures are designed to put the burden of approval on the publisher: comprehensive design proofs, 1st type proofs, page proofs, imposition proofs, press proofs, bindery proofs, any kind of proof you can require, all require "customer" approval before proceeding to the next step.

No one consistently publishes error free work. If you're seriously aiming to do so, hire the meanest proofreaders you can find, the most experienced editors, and never, ever proofread your own stuff: you didn't see the mistake when you made it and you won't see it if you "proof" it yourself.

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Bob