Kids are going to make mistakes. How you respond teaches more than the mistake itself.
Evan forgot to start his recording and did not realize it until most of the game day was gone. He finally confessed, hoped I had been recording, and lucky for us I was. My joke to him was, well, let's hope I was witty, since my footage was all we had.
This is actually why we restarted the Dinkum series in the first place, so this time we made sure our settings were right. I reminded him once about what to check next time and then let it go. Harping on it would only make him feel bad, and he already knew. He was embarrassed and apologetic after, and that is what matters.
When your kid messes up, how do you point it out without piling on?