Source Code; Analysis.

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•     The start of 'Source Code' is filmed on a helicopter, following the roads of New York and filming along the tracks of trains. This makes the people and trains seem small and vulnerable and foreshadows that something bad is going to happen. 
• The music used creates tension and puts people on edge and contrapuntal because the weather is bright and sunny and nothing bad happens. 
• The shot changes quickly to a close up of the main characters face and quickly to a close up of the main characters face and quickly changes between close-ups, over the shoulder shots and point of view shots to create tension. 
• The clips in the film are reasonably long, and the pace of them changes, depending on the mood of the main character. In the beginning of the film, the close up shot lasts reasonably long, because the actor is just waking up, and is slowly beginning to realise that he isn't where he is supposed to be. When the main character starts to panic, the shots become quicker and more 'jumpy', to make the audience on edge, and to emphasise the characters feelings. 

http://www.youtube.com/watch?v=QxDY6QNg7nQ