Somehow, I missed this review when first posted!
Thanks for buying the book and taking the time write to the review; I appreciate it.
It always drives me crazy when a tutorial makes deliberate mistakes without warning you in advance. There's nothing worse than trying something out, becoming frustrated that it doesn't work, then discovering a few paragraphs later that there was a deliberate mistake!
For this reason, on the few occasions that I have introduced deliberate mistakes into the practical exercises, I have clearly stated that things won't work as expected before the exercise begins! We then learn what the problem is, and how to put it right.
Thanks again,
Innes