The key to his message is that what we know about published science is based on studies of positive results in academia or research based businesses. The problem that we face is bias towards favorable results while negative results are almost completely ignored or never get published. You can have one study that says caffeine is linked to cancer and it will get published while 9 other studies on the same topic that had no significant finding are ignored. The public takes away the wrong message.
Here is the a second video also by Ben Goldacre.
You may find both of these very interesting to review. I can imagine anyone who took the trouble to get a degree for his cat really can be out to show how some people appearing to be legitimate can put false science out in the mainstream media.