Last modified: 2011-03-13 18:04:32 UTC
For instance, suppose we have page [[Foo]] that contains some links to [[Foo#bar]] and [[Foo#quux]]. Such links are frequently generated from footnotes. Now suppose that [[WP:FOO]] redirects to [[Foo]]. If we open the page from WP:FOO, we get the Foo page with the "redirected from" message. However, any click on any internal links on the page causes the page to be reloaded (from [[Foo]] this time) rather than simply move the browser a couple of screens down.
If you did that on purpose, you probably should have used [[#bar]] rather than explicit [[Foo#bar]].