Do you have a process in place? Can the process be improved to prevent such a mistake? A process doesn't have to be a rigid rule that comes from the top that everyone must follow, but you can empower employees to continuously establish, clearly define, and improve processes to 1)reduce mistakes(eliminate waste), and 2) improve efficiency. Empowering the employees themselves is a powerful tool. If you really want to understand what I am talking about, and understand the 8 wastes, check out the video's at 2secondlean.com
I know the author and his revelations have transformed life and my shop.
http://youtu.be/_pDcmUvtL6w

This is not an ad, I have learned and practice this way of thinking and it can help TF'ers and others greatly.

Brad, you should start a new topic with that concept, in relation to joinery.

It's only a mistake if you find it on the job site on raising day. Otherwise it's an opportunity for a creative solution.