Oh my goodness - the fact that this topic even exists makes me feel better haha. I was thinking I had to be the only person who could do something so stupid as to make a mistake on such an important application.
After receiving two rejections in the last week (tear), I thought I would look over my SOP.
HUGE MISTAKE. In the SOP I sent to all of the schools, I used the word "lead" instead of "led". And then in two of the SOPs, I somehow managed to delete the "s" from "this" when I was uploading. So, now I feel like all my hundreds of hours of prep and hard work are being flushed down the toilet for what look like careless mistakes. I had sooo many people review my SOP and then made a few changes before submission that, of course, had grammatical mistakes. UGHHHHH.