The answer is, it depends. If your manuscript is absolutely riddled with errors, then publishers and literary agents who skim your sample chapters might find it so distracting that they write you off without much consideration.
“I just got the manuscript back from my editor, and it’s covered in red. What do I do now?”
Most editors (or maybe it’s just me) like to delude themselves that they are so eagle-eyed, so perfectionist that no error would dare elude them. According to one study, however, human proofreaders—even professional ones—are at best 95% accurate. Test me, test me! Surely I can beat that. I think.
If you’re an author or screenwriter and you’ve never watched the YouTube series “Everything Wrong with…” by CinemaSins, then I have homework for you.
You’ve written something. You’ve poured all your skill, creativity, and time into it. You’ve made sacrifices to reach the finish line, and you can now congratulate yourself on a job well done. But what’s next? There are so many types of editing: