There is a growing trend of relying on spell check to proof read our work for us. Spell check is, however, not a proof reader and without using one, or re-reading our work word by word, some unintentionally hilarious errors get by.
For example, I was reading the first chapter offered as a sample to see if I would buy the book. It was a dark, grim story and the POV character's best mate was about to do graphic violence to a woman who'd tried to kill him. A great opener, gripping, horrific, tense....and totally spoiled when the author described the character as wearing a black vendetta around his neck. I cracked up laughing. I didn't buy the book. I didn't even finish the preview.
Spell check missed this because vendetta was spelled correctly. And in this case, the author lost a sale because of it. A friend of mine reported a professionally published steampunk work where the winches were consistently referred to as wenches. Which does present a unique engineering picture, but probably not one the author intended.
The takeaway for today is, spell check is nice but a proof reader is invaluable.