Make sure there are no typos in your resume nor grammatical errors. (careerdigital.com)
It is also extremely important that there are no typos in your query letter, your synopsis or your manuscript. (readersfavorite.com)
I can't tell you how many times I have seen hiring managers throw a perfectly good cover letter or resume into the «junk» pile because there were typos on it. (marijuanaresumes.com)