I was contacted by a temp agency who had me in to speak with one of the senior staff for our department. It was a fairly casual and quick interview. I agonized over what to wear beforehand, but it turns out that this is a very casual company. That doesn't mean you should dress down entirely, but it does mean you don't need a 4,000 dollar suit.
Everyone was friendly and welcoming. This has generally been the case with everyone I've interacted with in the E! International Department. NBCUniversal is a huge company with many different departments/divisions, so your experience may vary, but I've loved it here.