The DC10 going to BRU rather than FRA is true. I know, 'cos I was in the aircraft that landed after it. It made it into the papers the next day. Also, it's been used as a CRM module in the training department for the last few years in my company.
There are plenty of mistakes that could be made very easily, and every pilot is only as good as his or her last flight. However, I and various people I have spoken to have spend a long time trying to imagine the circumstances in which an aircraft we were flying might end up at the wrong airport with B737CFM or Airbus technology - but we couldn't.