When showing the Grimm book to Monroe, Felix explains that the books are so delicate that you have to wear gloves when touching the books. When Monroe shows the books to the HW, he is not wearing gloves when touching the pages of the book.
When Felix looks at the shipping manifest, the ZIP code 88390 is shown for Leipzig, Saxony, Germany. Not only does this ZIP not exist, the prefix 88 is assigned to a completely different region near the Swiss-German border.
Once again, Monroe's supposedly keen sense of smell is ignored. He does not even try to get on the scent of the wounded murderer and pursue him.