On this runitec.com you will find an analysis of often made spelling mistakes.
What is often misspelled, and why is the misspelling.
This is the research of runitec.com.
If you always wanted to know what other people for mistakes, then you will find the answer on this page.
It is also interesting, whether it's your bug a typo or a misspelling. There are modern method by which this can be detected. Probability theory plays an important role.