CSI: 5.2

These are the best CSI extras. There are only a few moments, especially at the very beginning of Season 5: Post Mortem, as the actors do that soundbite thing about the show, and what they think, when it looks like a rerun of some other DVD.

Actually, this featurette talks seriously and at some depth with the creative people about the subject that occupies every CSI fan's mind - why break up the team? Obviously it was a risk, but they have taken risks on this show before, many times. They wanted to "open it up" and give themselves "more to play with." It makes sense and on the whole it works.

Marc Vann, who plays Conrad, the new boss responsible for breaking up the team, is funny about being hated. He talks about being spotted in the street by people who think they recognise his face, but can't place him. "I don't know who this guy is," they say, "but I don't like him." Gary Dourdan (Warrick) and Marg Helgenberger (Catherine) are equally funny about flirting.

CSI: Procedures On The Scene And In The Lab is one of those tecchie science explanatory numbers, in which backroom guys explain stuff you hadn't thought about, like how to put a fingerprint on a feather and what a burn victim really looks like. There are eight separate disciplines (if you will), from Identifying Tyre Treads (on a leather jacket) to A Star Shaped Wound (what happens when you shoot someone in the head from very close range). Although this might sound geekie, it's fascinating.

CSI: Tarantino Style is like a Behind The Scenes on Grave Danger and it's full of fun because Quentin's enthusiasm and energy is catching. "He is a mature filmmaker and a child at heart," William Petersen (Grissom) says. "He can't contain himself."

The CSI team kept meeting Tarantino at award ceremonies and he would come up and say what a fan he was. Finally, Petersen called him and said, "Come and direct an episode." He didn't hesitate, although admits that it was the toughest 16 days filming he has ever spent.

Watching him at work on the set is like watching a kid in a cookie factory. Everyone was enjoying themselves so much that when they realised they were going over time and were going to need to cut a lot of stuff out to fit it in the hour, a decision was made to double up and have a two hour show.

"I can't help but do the thing I do," Quentin says, as if apologising for being Tarantino.

"He never stops the impulse," Petersen says. And that's a compliment!