Friends with Benefits Title Sequence

Movie clip- http://www.putlocker.com/file/C8A19E830ED5798F

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With looking at both the Friends with Benefits and 27 Dresses title sequences it came to my attention that there isn't much information about the main protagonists, the director or any of the production team. This could suggests that the audience should know who is playing the protagonists and that they don't need an introduction because they are so well known and 'amazing'.