Yes, this tiny booklet has 13 mistakes in it. I am a native German speaker and professional translator. My intent was to order the booklet for an Intro to German for elementary school-aged children. Thankfully I just ordered one sample. I contacted the publisher and advised them of the problem. They expected me to give them the details about the mistakes free of charge. I would think that they should take it out of the royalties of the author, get the problems corrected, and meanwhile remove the book. If you are just looking for something for your kids to play with it's probably a good choice, but if it's supposed to be used for teaching I would steer clear. I would have corrected a couple of things by hand, but this book is clearly of the lowest standard.