Yeah, I'm confused by this too.  When I leave it set to 4, I get consistent errors for the "Check input error messages" test.  Here's the traceback: https://gist.github.com/wedaly/8022470

And the screenshot of the failure: 
![image](https://f.cloud.github.com/assets/2948394/1773508/97dc66bc-67e9-11e3-8630-58676fff47d6.png)

Using the same selector in the JS console, I find only three elements:

![image](https://f.cloud.github.com/assets/2948394/1773513/b2a974d0-67e9-11e3-9d78-80bdeeb24b90.png)

Any idea what might be going on?  It's clearly passing in Jenkins :)