Once upon a time, there was no printing press and books had to be written out by hand. Since the Bible is the oldest book, it stands to reasoning that there are some handwritten ones out there, and since people make errors, there are some fun transcriptions in some of them.
Apparently, those errors are worth a lot of money. Coming up in September and then October are 2 Bible auctions from the Mel and Judy Meadows collection. Some are perfect, while others have those fun aforementioned errors.