There are movie trailers that contain scenes that are removed from released movie.
Development (look at credits to see how many people are involved) is a complex, parallel and highly non-linear task. Trailers are something that's completely on the side-line, and commonly include removed or changed content.
Why remove content? Would you rather have a game with trailer that's consistent and features broken content, or a game that was improved after issues, art, performance, design or concepts were adjusted?
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