What I didnt list or wasn't sure about, I talked to the HR lady about when I handed in my application... there's some freelance web design I did when i was 18 that I wasn't sure if I ever did a W-2 or 1099 for... so I told her and she said she'd just make a note of it and that it wouldn't be a big deal. I think they'd care a lot more if they caught something that you were trying to hide that's bad -- not a simple mistake or something minor like that. I'm curious to see what my background check shows up...