This book is a delightful visual spectacle for children (and adults!). As a primary school teacher, I also recommend its use for teaching various subjects...
Maths: It counts from 1-10 and uses numerals (included a pop-up tree with nines on it).
English: Lots of made up vocabulary and simple sentences.
Science: One page, the clicker page, could be linked to a unit on Sound in Kindergarten. The use of pop-ups could also be discussed and explored in a lesson on gravity.
I've got a reading buddy in year 2 would gave this a 5/5, so I'm going to give it that too. A beautiful book that is heaps of fun to read. It also has one red dot to find on every page: great for engaging many differently aged children.