Fixed MVC reference bug and ReturnUrl label not being hidden correclty

Hi,
I'm going through your Blog article on ASP.NET identity which I'm finding very useful.  While working through it I've run into a few issues which I've fixed in my fork.  
Do you agree with the fixes I've done?  The Return URL one seems quite simple but the MVC reference issue I had seems quite odd.  I don't really understand why I have to copy the MVC dll for this to work.
I'd appreciate your thoughts.

Regards

Ross