Observation skills

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I was reviewing a document the company I'm working for was preparing for a client and I was going fairly quickly through the pages when I noticed one of the columns in the financial projections section was in asian script(whether it was Mandarin, Cantonese, Korean, Kanji, or another language I don't know. It was too small to tell.) and I immediately pointed it out to the manager of the document department. Not because I wanted to show she'd made a mistake, because I was genuinely curious why it was there. She thanked me for noticing and said she'd fix it asap. How could she not have seen it? Was it a case of tunnel vision where she was so focused on the project that one character slipped by her? I understand without talking to her, it's impossible to know for sure but I'm wondering if anyone here has a theory as to why a professional like her would miss such a glaring error?(As an aside, the client was paying us close to $12,000 for this document)

I wonder if it's possible to be so good at what one does that they get domestically blind or some such, taking it for granted that it is ok. I mean there's only so many times I can go over something before I get bored with it. Then I'd move from a state of attention to skimming, and from there to missing chinese characters. No excuse, but understandable.