Hah, what a no-brainer error. I'm going to add that to my list.
I would drown if I included specific mistakes. I only note down the errors in an overly general way (e.g. I would have a subheading called "decision making" and under that I would have: - failing to make important decisions promptly - making decisions without taking loved ones into account - having high expectations of myself and others; etc). My mistakes (for the vast majority of the time) are recurring, so that chops off a whole bunch.
This is the public group rationality diary for October 6-18, 2015. It's a place to record and chat about it if you have done, or are actively doing, things like:
Established a useful new habit
Obtained new evidence that made you change your mind about some belief
Decided to behave in a different way in some set of situations
Optimized some part of a common routine or cached behavior
Consciously changed your emotions or affect with respect to something
Consciously pursued new valuable information about something that could make a big difference in your life
Learned something new about your beliefs, behavior, or life that surprised you
Tried doing any of the above and failed
Or anything else interesting which you want to share, so that other people can think about it, and perhaps be inspired to take action themselves. Try to include enough details so that everyone can use each other's experiences to learn about what tends to work out, and what doesn't tend to work out.