Let’s run through this one more time for the folks at Yahoo! Style: If you’re unsure of the spelling of a word, consult a dictionary. If a word looks funny (like, oh, say, maybe throughs), consult a dictionary:
If the writer had done that, she might have seen that run-throughs is a noun requiring a hyphen. Just in case incidents like this happen to arise, editors can cut them out and replace them with the correct word. Editors can also be sure pronouns (like them, not it) match their antecedents (which in this case is incidents).