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For more science on the topic of how intentional "mistakes" can aid in memory retention, I recommend the book Impossible to Ignore, by Dr. Carmen Simon. The gist of it is that you need to surprise the brain or make it work a little extra to form memories. Our brains automatically delete our routine memories fairly quickly. Most of us don't know what we were doing on this day a year ago. But we easily remember things that violate our expectations.