I remember in 5th grade there was one choose your own adventure book, had to do with vampires and a train (thats all I remember… it was really a horrible book)
There was a piece of paper taped to the inside cover explaining if you wanted to go from situation on page so and so you had to turn to a different page because they screwed up.
I guess that would’ve been put out by the company after printing but before sale, as I highly doubt the librarian I had at the time would have cared… I don’t think those books were her type.