I think the showings of the mistakes and how to correct them are great, however, I might recommend that if you added that portion to a troubleshooting chapter, it would allow the user to learn the "perfect world" scenario and to recap the user's knowledge and awareness of the troubleshooting techniques.
PLEASE do not take it this the wrong way.  If it is a pain, then leave it as is.  I find the mistakes very useful and have caught some of the mistakes on my own.  (Standing up and bowing for the loud applause) sad thing is it was only 2 out of the entire series.  Keep up the great work
(Chanting "Go Rick, Go Rick, it's your birthday"
Thanks
Bryan