I actually stumbled across this as a link while browsing some other movie related information but the link shows how deleted scenes and in some cases alternate endings can very much alter a movie.
My personal favorite has to be the Hancock deleted scene.
http://www.cracked.com/article_19312...ined-film.html
The article shows each deleted scene/alternate ending sequence but also discusses the pros and cons and how it would have detracted from the overall movie, it is an interesting article.
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