After moving a page the move is listed on the history of that page. But the undo link makes no sense for that entry.
Example: http://www.mediawiki.org/w/index.php?title=User:Subfader/Open_questions...&action=history
When you click undo your taken to the edit window loading the current version and reading some crap info.
Version: 1.16.x
Severity: minor