One thing that did annoy me is the author didn't fully follow their own advice:
7. DON’T STEAL IDEAS
This goes for any form of creative expression. You see what I did at the top of this article? I gave credit where credit is due because I borrowed an idea and turned it into something of my own. Same thing for photos — if you borrow a concept from another photographer, make sure you give them credit. And look at it this way — if you inspired others to create new things, wouldn’t you like it if they gave you recognition for that?
While they acknowledge the idea for the article and even acknowledge the photographers, Douglas Adams (nor the publisher) is not acknowledged for the "Don't Panic" photo at the beginning.
Although I think Douglas Adams should be compulsory reading and would assume most would know "Don't panic"!