Spellcheckers can pick up most typos, but not all.
Turning a published novel written before the word processing era into an e-book involves scanning the physical book, then using OCR software to turn the scan into editable text. The company that did this for Summit (eBook Prep) did a fine job scanning and cleaning up the text, but things slip through. This one tickled me. The original sentence was:
He looked at the faces of his fans.
The scanning/OCR process turned this into:
He looked at the feces of his fans.
The spellchecker liked this just fine!