A trailer is an "official preview" that's created by specialists who are simply trying to make the movie look its best. I imagine that a regular preview or TV spot is simply a few of the movie's moments crammed together to show some scenes for a short TV clip. That's my guess, anyway!
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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