If asked what the biggest mistake doctoral candidates make, I would say ignoring the comments or recommendations from their mentors and/or committee members. Mentors and committee members typically do not re-read dissertations or proposals each time they do a review. They keep a checklist or log of all comments or recommendations they have made and check to see that these have been addressed. By not addressing each comment, a candidate risks angering or even insulting a mentor or a committee member.
If you, as a doctoral candidate, do nothing else, keep a log of all comments and recommendations made by your mentor and committee members, and make certain you address each one before you resubmit your proposal or dissertation. If the recommendations or comments are from the dean or formal editor, absolutely do not resubmit until you have addressed each one.
Remember, you must obtain signatures from your mentor, both committee members, and the dean before you can graduate. You need these professionals.
As your blog hostess, I suppose I should tell you something you would not find on LinkedIn or a curriculum vita, so I shall. I am an animal lover, a semi-professional photographer, a seamstress, and a career student who just happens to have the most amazing teenage granddaughters ever born! My other business is a writing service for children: www.atlantapawpals.com