This book is about all the three Diary of a Wimpy Kid movies. Here is the trailer for the third movie, Dog Days. If you ever wondered how a movie is made you could watch the special features on a blu-ray disc but that does not answer all the the questions you have, so I would recommend this book for that reason too.
The Diary of a Wimpy Kid series
If you do not like books with no pictures and lots of complicated words then this is the book for you, I think this book goes well with the bestselling series along with the do it your self book. This book is a constant diary of every painstaking step of the way for all three movies. Inside this book it also explains where the young actors slept and what size of room you would be given: the bigger your room the bigger your job.
The Wimpy Kid Movie Diary