Why is the House M.D. pilot so different from the rest?

Why was the first episode of House so different? The camera angles, lighting, affects. Also in the characters, everyone was so serious, there was absolute no humor, and it was a bit "dark". I don't get it whay are they trying to show? It's episode one in season one, and I have included a link at the bottom where... show more Why was the first episode of House so different? The camera angles, lighting, affects. Also in the characters, everyone was so serious, there was absolute no humor, and it was a bit "dark". I don't get it whay are they trying to show? It's episode one in season one, and I have included a link at the bottom where you can legally watch it for free.

http://tvshack.net/tv_shows/House/season...
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