No way to tell the errors apart. You have companies giving 99 cent promotions. So who knows which are promotions and which are errors. If they post it on their sites they should live up to it. If anything, take it out of the salary of the person responsible for making the updates. Things like a decimal point being off is due to carelessness. Someone has to pay the piper. After the first time they mess up and get there salary docked, I doubt you will ever seem them make another mistake in the future.