I got some good advice about revision recently: create a watch list. What is a watch list in this context, you ask? Well, I'll tell you. :) A watch list is where an author examines his/her work and makes a note of their own common mistakes or repeats, writes them down, and then corrects them during the revision process. For example, my characters seem to smile or grin several times a page. Logically I know it's a bad idea to repeat actions on the same page, but when I go back and look: there they are. During revision, then, I need to get rid of most of those. As another example, I have a critique partner who always uses waive instead of wave. (Of course, spell-check doesn't catch this!)
How about you? Do you have anything you need to watch out for?