Spell check is on. No errors were caught. Some words legitimately have more than one correct spelling. Unfortunately for Gree, their typos have never been such words.
http://dictionary.reference.com/browse/diarrhoea
I could swear I did originally spell tha sans "o", so spell check must be responsible for that. Funny how my spell check inserts a variation of a spelling of a word, and someone tells me to use spellcheck. Having a Gree moment this morning yourself, sir? Lol