We would very much appreciate your help in finding and correcting errors in our public domain books. We are working on a simplified user interface which would allow our users to make these corrections directly but we don't yet have a timeline for its implementation.
In the meantime, if you would like to simply make a note of the errors you find, even in a simple text file, that would be a big help. The best way is to make a note of the phrase with the error, and note the correction next to or below it.
Once upon a tune (error)
Don't forget to include the title / author of the book and to make things easier, the url of the book on Feedbooks.
Feedbooks is a community-based site and the reason we are able to provide such an incredibly rich catalogue is thanks to all our users who contribute books they'd like to make available. If you'd like to get involved, we would be very happy to count you as one of our Public Domain contributors. If you are interested in participating, there are still lots of Public Domain books just waiting for someone to upload them.
It's easy to upload books to Feedbooks. Here is a step-by-step illustrated guide showing how to do it: http://www.feedbooks.com/help/public-domain and if you've got any more questions we are happy to help.
We'd be very happy to have you join us, so we hope you'll give it a try. As a bonus, you'll be able to download your copy of the ebooks you contribute before everyone else, by generating a Preview copy.