So, I have advice for anyone who thinks their manuscript is typo free. Look again. Look up, look down, look to the left, the right, and all around. Look under, then hold it up against a light and look some more. Look while eating, look while sleeping. Look while waiting for the dryer to finish, look while you're on the toilet. Look, look, and then when you're done looking . . . look again.
Put your manuscript away for awhile, take a break. Then run back in the house, turn on the computer or grab the notebook and look some more. I'm looking right now.