Do you ever read a book and marvel at the errors that you find? Poor spelling, bad grammar, horrific editing, misrepresented facts, outright falsehoods, conflicts, inconsistencies, and the sort? Well, I do. I'm currently going through J.R.R. Tolkien's works line-by-line and am amazed at how many errors, conflicts, inconsistencies, and the like are to be found therein, these in works that have been in print for 65-80 years now.
What to do? Glad that you asked! This site lets you catalog all that you find for all to see and for the author and publisher to rectify in the next edition. It's become a hobby of mine and at least the practice forces you to read every word and pay close attention. As a matter of record, Tolkien never successfully reconciled The Hobbit with The Lord of the Rings, and, boy, does it ever become obvious.
Have a look through the Corrigenda List and see what all has been found wrong with some of your favorite reads.