The very first copies of Huckleberry Finn had errors! Today these editions are considered rare and very valuable. Those copies can go for as much as $15,000 each and all because they had mistakes.

The dust jacket on Ernest Hemingway’s The Sun Also Rises had an error stating that he was also the author of In Our Times. This led readers to think that In Our Times came before The Sun Also Rises. If you can find a copy with that error on the dust jacket and want to buy it, the price you would be asked to pay is anybody’s guess! But I am confident it would be in the 10’s of thousands.