Oliver Grigsby posted a blog about 4x16 and it have some Behind the Scenes stories:
• "Zach and Hayden are brilliant in all of these scenes, but I especially love Zach in this one. He's pouring his heart out to her and she (understandably) doesn't give a hoot. His subtle facial reactions to her are brilliant. The director and I met with Zach and Hayden before filming any of this and rehearsed all of their scenes together. They had some great input and had clearly thought about the scenes and their characters. Actors typically don't film every day but that doesn't mean they're not working. Getting a script is like getting homework or having to study for a test. These two really studied the material, came in mentally prepared and I think it paid off on the screen. I can't commend them enough."