A minor issue to be sure, and perhaps an edge case, but...
When a user has a fairly high reputation and a good number of badges, and edits a post by someone else, the user card can get truncated. Like so:
Note that the "106" next to the bronze badge icon is overwritten by the user card next to it.
This is on Google Chrome 29. I also see it on Firefox 23 but not IE 10. (All on Windows 7.)