Even if you're meticulous when completing your college application, there's a chance that you'll make a mistake. You may leave out something, fail to follow instructions, or do something incorrectly. If you realize you've made a mistake, don't panic. College admissions officers aren’t going to nitpick over a minor error, but several errors may show you in a bad light. If you have significant errors or omissions, reach out to the admissions office of the college you applied to.