I proofread ebooks for a publisher (yes, some of them do have people checking their scanned ebooks!). Hopefully you may have come across slightly fewer errors, amusing or otherwise, as a result
One book had a load of "d"s from "cl"s - a girl who "dung" to her dad's leg, rather than "clung". You might say the OCR came "dose, but no cigar!"
A historical novel described the Battle of Bannockbum rather than Bannockburn.
Sometimes errors get flagged that are deliberate misspellings for reasons within the story, requiring it to be noted that "Misspeelings" is deliberately ironic.