The best thing that can be done is to shoot it with a film mentality. Putting effort into achieving a narow focus, will yield the best results. For a very obvious example of this type of focus, take a look at the closing conversation between Lucy Liu and Uma on the Kill Bill trailer. This is however very hard to achieve using most dv/video cameras but it can be done by using a neutral density filter (forcing you to keep the iris wide open) and moving the camera away from the subject and zooming in, manual focus etc. In my experience, this is the best way, without resorting to cheap tactics like adding grain, it creates a very clean film like look.