The new bit of tape was interesting, given how they intercut it with Michael using the computer. But I think the more interesting question is why it was cut out and who did it. I don't think it could have been Desmond because he didn't give any indication that he knew there were other hatches. Would "person x" cut it out in the hopes that someone would use the computer for something other than the numbers? Did the rules of the experiment change? And what "incident" is going to happen now that Michael has used the computer?
It also makes me wonder if the computer is something along the Mirror of Erised from Harry Potter - it shows you what you most want to see. That would be along the lines of a psychological experiment, wouldn't it? See how crazy people go to get access to the dearest wish in their heart. And for Michael that would obviously be to find Walt.