Today I got a resume where the candidate had left Word's Track Changes feature on. As a result, I could see all the edits someone had made on his resume, and I know that they weren't his own, because they also included suggestions like "you have to beef up the first paragraph."
I don't have a problem with him having editing help; I have a problem with the carelessness. It made him an instant rejection, even though he was otherwise was qualified.
There are so many silly ways of shooting yourself in the foot that are easily avoided if you pay attention.