This is a topic covered in the most recent "Things" newsletter (excerpt below)
Its something I think I do to at least some extent (I'm pretty sure my directs think I do it... but they've been under- / un-managed in the past).
How do you know if you are doing it and how do you avoid it?
"Adding Too Much Value
One of my favorite parts of What Got You Here Won’t Get You There is called “Adding Too Much Value.” The boss who does this always has to point out something that can be improved in someone else’s work, or new idea. She sees it as helping something be better, getting to perfect. But it rarely works that way. It’s just seen as putting someone else in their place, and showing off your smarts.
I do it some times, and when I’m self aware enough to notice, gosh I hate it. So selfish. Don’t do as I do."