Everyone makes mistakes and it can be forgiven. Then again, it all depends on what kind of colleges you are applying to. If you are applying to IVY League schools, then you kinda dug a hole for yourself while others starts at ground zero. If you are applying to 'ok' schools or community colleges, you are probably ok. But the best thing is to get another pair of eyes to review the application from top to bottom, then submit. Afterall, you shouldn't be doing this last minute anyways.