<p>Is it ever kosher to submit an additional, attached paper to your application explaining any anomalies in your schedule/grades/etc? This paper would be separate from my two essays.</p>
<p>That's what the Additional Information section on the application itself is for. Don't submit an attached paper. Just write it there. (And if it doesn't "fit" there, you've written too much - be succinct and to the point.)</p>