Is it ok to leave some jobs out of a resume?

Some employers will run a background check of public records to verify your employment so you need to be careful on how you present your work history.

Large gaps in time -or- times that don't align with what's on record (e.g. you said you worked at a place for 2 years and they show you on roll for 6 months) will raise red flags.

The internet age has allowed prospective employers a very detailed look into your past. For a small fee they can look up public records files, if you filed taxes, schools you went to, marriage, moves, the works.

My advice would be to put all your job history on your resume so there are no gaps and/or inconsistencies. For those jobs that you want to de-emphasize only put a sentence about what you did. As you noted, most of those jobs aren't going to relate to your current career aspirations and won't be the center of discussion anyway.

Your interview is the first and only chance you get to make a strong first impression. You sound like an honest hard working person you don't want to jeopardize that. If they ask you if you liked working at Taco Bell, be honest but not petty.

I'd rather you tell me: "I worked hard while I was there and enjoyed the opportunity but in the end it just wasn't for me. I don't really enjoy cooking and the schedule demands didn't fit my school studies so I looked for other opportunities to help put myself through school." That's a much easier conversation to have than me asking you why there was a gap and/or that your background check showed you had omitted past employers. To me that says you're hiding something.