The other day my daughter selected Herve Tullet's Press Here as one of her bedtime books. We've read this book many times, but this reading was a bit different. As we opened the book she said: "Let's see what happens if we don't do what it say." I agreed, and for the first few pages, we did not "press here" or shake the book or otherwise follow Tullet's instructions. Sometimes we would do the opposite of what was requested (e.g. pressing a different dot). Then we would turn the page, and (of course) see the outcome that would have been expected had we done what was asked.
My daughter was not disappointed by this - she seemed more satisfied than anything. I believe this confirmed her hypothesis that pressing on the dots or whatever would not, in fact, change what was displayed on the next page. Once we had done this for a few pages, she was ready to go back to pressing, shaking, blowing, etc. She knew that there things wouldn't impact the outcome, but she was unable to resist the fun of doing these things anyway.
Coincidentally, a new companion book to Press Here, Let's Play, arrived at our house two days later. She dropped what she was doing, and had to read it immediately. Her appreciation for these books has not been spoiled by her understanding of how they work (or don't work). For me, watching her developing understanding is fascinating.