Firstly, as per the Mirror, Mourinho claimed the late penalty that saved his team a point was a valid one. It wasn't.
Secondly, and if the Telegraph are to be believed, Mourinho insulted Baggies defender Jonas Olsson in the tunnel by calling him a "Mickey Mouse player."
Whatever Olsson said to provoke The Special One, that kind of riposte lacks class. It's certainly not the stuff of a suave leader who's set to rule England this season.
And that's why Mourinho goes in the book.