Things I lie about:
1. References. I generally put someone more reliable than my old bosses to actually pick up the phone. I'll call people in advance and let them know they're pretending to have worked with me.
References are generally not as relied on as they once were, because this practice is so common, but it still helps to have reliable people on there. My old bosses would have never picked up the phone and had time to remember me, and say whether I rocked or not.
2. Length of time in a position. If I worked 2 weekends a month for 6-7 months.. I just put that I was at that job for 6-7 months. I don't put if it was full time or part time or w/e. If they ask, I say part-time or full-time depending on what looks better. It helps to have no gaps in your unemployed time periods sans having an explanation like school or having a baby.
3. Pay. I lie about what I was paid at the positions I was at to reflect more of what I am looking for in the position I want. It doesn't matter that I was paid $6 an hour at Golden Corral in 2004. If they ask about pay, I generally give statements like $11-12 an hour for admin work, $10 an hour for easy work, etc.
4. Freelance work. I say I worked freelance work during any gaps, to boost up previous qualifications. I also say I've volunteered at places. I know how to use work/excel.. but saying I volunteered at a church as a clerical assistant working with word/excel looks better on the resume.
What I don't lie about on resumes:
1. Where I've worked/type of work. Background checks will forgive date confusions and things like that.. but if you say you worked at Execu-co and you really worked at Dairy Queen, it doesn't reflect well. Also, your experience reflects all of this, so saying you're experienced at one thing and not actually being so will show up. You can't say you've had experience as an instructor to someone with 15 years of experience.. they'll call you on your bullshit.
2. The duties at the jobs I worked. This showcases the experience I have.. all I do is make it look more important with flowery language.
3. My Education.
4. My contact information.
I lie about the unimportant stuff... and embellish the rest.