lipglosskaz:

Jules: As fans we get to see a little of what you have to cut in making an episode, from the gag reel and deleted scenes that are included on the DVD. You must also have a lot of material for the gag reel?

Jimmy: Oh, with the boys, are you kidding me? Those guys are constantly making each other laugh. Some of it is actually labelled gag by the director! But nine times out of 10 we find it at the end of a scene or in the middle of a scene. One of the things we’re doing on “Shaving People, Punting Things” is a gag that happened in the middle of a scene and we kind of re-cut it and did some things to it.

Jared and Jensen are constantly trying to get each other to break. Jensen is hard to be broken; that guy can just put his face on and just go. It’s very rare that I see Jared break Jensen, although it does happen. Jared throws everything at him including the kitchen sink. He did a whole scene where he was saying all his lines in Spanish, and Jensen just kept going, just kept acting. It was amazing.

Jared and Jensen are so good at what they do, it’s not even funny. I mean, they are Sam and Dean. I would love for you guys to see footage of them busting each other up to the point where they can’t even talk and the director goes, “Okay, settle and action”, and they snap right back into character. Even when they mess around, they will come back and give you exactly what you need. They’re just incredible at it. They’re so good.

I think the true brilliance of Jared and Jensen is that you can see how much they appreciate that this is a once in a lifetime thing. You never hear them complain; they are always giving it their all. It’s great to see actors who appreciate that because it’s so rare that you get this. This is gold, it is lightning striking … and usually, it doesn’t strike twice.   (superwiki link)