Jake Gyllenhaal attending 'Source Code' Screening in Berlin, on 7th April 2011 (c) wetdarkandwild.com
Scan of Jake Gyllenhaal in 7 Jours (Canada) magazine
Scan of Duncan Jones in Time Out London"When I interviewed Duncan Jones about the film, I asked him that very question and he emphatically denied it, and said the script had always been designed the way we see it in the film, but he didn’t have a plausible explanation for the change of heart within the story. Maybe that explains why Geoffrey Wright walks with a limp and a cane throughout the film (we are never told why), simply because he needed something to do while going through the rote and dry story points.
Farmiga’s character looks pained throughout, but we can understand why once we are told the reasons that Colter has specifically been chosen. Farmiga’s character is very similar to the one played by Deborah Kara Unger in David Fincher’s The Game, where she manipulates the main character through one phony experience after another. 
Deborah Kara Unger in The Game (1997) directed by David Fincher"The Game" was also cold and focused until it packs the emotion into the final 10 minutes, but at least there the explanation is what makes the emotion a necessary outlet, and we’re still left wondering what was really going on after the movie ends. Source Code is also cold and clinical (if we learn anything, it’s that, just like in Back to the Future, time travel gives you frost bite), but the emotion tacked on at the end is just that, tacked on. In Source Code, we don’t wonder anything at the end except why we didn’t leave the theater at the 80 minute mark". Source: www.examiner.com
Listen to Duncan Jones full interview
"Jake Gyllenhaal is the movie's great asset. This spring has been the season of three movies made worthy by their leading men, who carried them through perilous plotting. Matthew McConaughey in The Lincoln Lawyer, Bradley Cooper in Limitless, and now Gyllenhaal in Source Code all made their movies better than they might have been. They each exhibited an artful ability to humanize their characters -- good guys under extreme pressure -- in a dehumanized world of gamesmanship". Source: tonymacklin.net
