Consistency between your personal statement and your exhibits, checked line by line
Did a full pass specifically checking every factual claim in my personal statement against the exhibit that was supposed to support it, and found more small mismatches than I expected — nothing dishonest, just drift that had built up as the statement went through multiple drafts while some exhibits were added or changed later. Examples of what I caught: a dollar figure in the statement that was slightly off from the number in the supporting document (an old draft's number that never got updated), a date range described as "two years" in the statement that was actually 18 months per the actual documentation, a project described as "led" in the statement where the underlying documentation more precisely showed a co-leadership role. None of these were serious on their own, but a reviewer cross-checking a statement against exhibits and finding several small mismatches has reason to read everything else more skeptically too — credibility is built cumulatively, and it can erode the same way. Worth doing this exact line-by-line pass yourself before anyone else does it for you.