Learning How Much I Get Wrong While Editing

I don't know about you, but when I edit something I haven't touched for a while, I find instances where I obviously checked out my brain for a while and just let my fingers continue to type.  And the longer it's been since I touched a story, the more chance there is that I'll doubt whether I was really sane while I wrote it.

Take my current endeavor for example.  I'm tightening up my manuscript to hand over to Davin for the critique I won.  I started out just working on the end because it wasn't really as good as I wanted it to be.  But as I started reading through the story, I found huge errors.  Like when I realized I'd had my main character being aware of things (aka more omniscient) than he should be.  I was explaining the story via the character's internal mental dialogue rather than letting him learn things in a more natural way.  Yeah, not a great way to showcase my writing ability.

So now I'm overly aware of this trait and I'm finding I did this more often than I thought.  Wow, what a newbie mistake.  On the good side, I'm catching these things where I might not have before.  So I guess I can say I'm getting better at correcting myself, even if I haven't yet learned not to make these errors while I craft the initial story.  Baby steps they may be, but at least it's a form of progress.

What big mistakes do you see as you go back to edit your work?