If you've ever found typos in a table or list that you're positive you remember spell checking, chances are that the typos are in words that are purposely skipped during the spell check.
By default, SpellChecker ignores words that are all upper-case or that have numbers in them. In most cases, this is probably fine. However, especially with purchased data, you'll occasionally come across tables where everything is capitalized.
Fortunately, you can change the way SpellChecker works so that all words are included.
To do so, run the SpellChecker on a data selection that will cause the Spelling dialog box to be displayed.
Then, click the Options button and clear the Words In UPPERCASE and Words With Numbers check boxes.