Ivan: Bedtime stories sampling

After two days of "adventurous" bedtime reading, where we read a couple of new stories and which I subsequently heard Ivan recite to himself during play time (such as Madeline), we're back to the old favorites: policeman, sailor dog and  Crispin's Crispian.

We've been reading those three stories every night since February, when he got the book for his birthday. He has memorized these stories, and can recite them as I turn the pages. He also calls me out if I forget, omit or mess up a word. And in each story there is a place where he thinks the text says one word where in fact it says something else. But if I read what the text actually says I get corrected that I have to say the other word. For example, in policeman in the dark he's convinced that one sentence ends with holster, where in fact the word is hand, but I always have to remember to say holster, not hand, or else....

But it was only tonight that he asked me, "Mama, what's a burglar? Mama, what's a sheep dog?" which is what the policeman in the dark story is really all about. So have we been reading this story for the last six months without him understanding it?