@citynugget I was in your same exact shoes last year and, let me tell you, I know how uncomfortable the shoes are. Like "these wooden clogs are giving me blisters" uncomfortable. You can check back on the thread from last year -- I was very much agonizing over the mistakes I made, and the typos that followed.
And I won't sugar coat it: I do kinda think that a big reason that I didn't get accepted last year was because of that. I do think the typos had an effect on my application overall, as it spoke ill of my preparation and (even unfairly) "effort" in preparing the material. But you know the funny thing? Year 1 for me, I went over my stuff like a dozen times before I submitted my material. I had no issues at all grammar and/or typo wise as far as I can tell (as far as I can still tell, actually.) But I still think my material last year was "better," problems and all. It spoke more to me as a creator, which is the most I can ask for at the end of the day.
And going into this year? I made sure not to make the same mistakes as last year. I haven't revisited any of my material before I submitted it (NICE TRY SATAN, NOT DOING IT), but I fine-toothed the sucker. I'm pretty sure whatever grammar errors might be in it will be rather inconsequential. And creatively, I just built up more at what I was trying to do last year. So, yes, personally, I feel my stuff has only gotten better year after year. In slow increments, maybe, but better is better. And if I didn't beat myself so much over the mistakes of the past, I probably wouldn't have worked so hard the next time to make up for them. And if I keep improving my applications based on the previous years, maybe one day, when I'm like 82 or something, I'll actually get accepted into this program!
As a wise alien puppet once said...greatest teacher, failure is. Ultimately, the mistakes we make will just make us better if we keep working at it. It's the latter part that's the rub, though.
So TL;DR -- I feel you completely. It sucks. But as
@Chris W said, it's a learning experience. Was for me, at least.