I can list only one thing? That's impossible.
- formatting inconsistencies. Pick one font and stick with it. You can vary the size, use a conservative amount of bold, italics, or underlining, center, etc, but keep one font!
- "responsible for. . . " I counted this 27 times on one resume. Please, just say you did it: Responsible for creating employee work schedules." "Created employee work schedules."
- Tense inconsistencies. Talking about past jobs in the present tense, and then slipping into past tense.
- Bullet issues. Bullets should be the same size, properly aligned. Sometimes this can be tricky. Don't give up!
- the words "e-mail" and "phone" preceding this information in the header. Everyone knows that's what they are! Also, forgetting to include an e-mail address!
- Using the official company job description rather than telling me what you really did, in your own words. "May be assigned to work at remote locations." May? were you or weren't you?
- Not knowing how to right margin justify. If you put the city/state, or dates of employment, on the right side, line them all up. The easiest way is to create a 2x2 table, then remove the borders.
- Taking full credit for running the company single-handedly. "Set up equipment, manufactured widgets, packaged products, stored in warehouse, loaded trucks, and transported products." If you were successful, it is only because you had a good team. Give them credit!
- Forgetting to showcase your people skills. I see this on management resumes. The ability to recognize and develop talent is important -not everyone can do it.
- Trying to use big fancy words that aren't in your vocabulary, and not using them correctly.
- Having someone else write the resume! The thought that goes into the resume will prepare you for the interview. There are no shortcuts!
- Not cleaning it up. You want to convey a lot of information with a few words. It needs to be "tight." I've seen really wordy resumes that say nothing. And really short resumes that also say nothing. Your challenge is to say a lot with a few words. This takes work, and a mastery of the language.
I imagine I left something out, but this is a good start!