Problems in chapter "MarionetteJS (Backbone.Marionette)"

I am new to Backbone and I was hoping to read on Marionette, but I noticed few problematic things:

The part explaining about Marionette's Layout is very unclear to me in general. Looking in the documentation of Marionette I see different usage than the one described in this book (e.g. there is an attribute `regions` defined within the Layout and in the book it is missing).
Also this chapter states that the Header is a Layout, but the source code afterwards extends from `Marionette.ItemView`.

```
// Layout Header View
// ------------------

Layout.Header = Marionette.ItemView.extend({
```

Otherwise, thanks for the efforts and the book looks great so far!