Source Code simply because any writer/producer who would employ such a title for a film that has absolutely nothing to do with actual source code must not be very technologically inclined. What then, can be expected from the rest of the script? The sad reality is, a whole lot more fiction than science. Yet, the film is entertaining enough, and the idea original enough, that it deserves some credit to allow for movie goers enjoying it as a pure fantasy rather than the sci-fi thriller that it presumes to be.
Let's face it, you can't say much about the plot of this film without spoiling a lot of the surprises that actually made it enjoyable, so I'm putting in the alert early. The main "bug" in that respect is the believability of the experimental technology that forms the film's backdrop. It is already stretching the imagination to think that one could read the mind of another living human being in such a way that you could view their memory like it was a video recorder, but that's nothing new to Hollywood sci-fi. Now try that with someone who's already died in a train accident. Take the dead person's brain and somehow create a virtual reality playback of the final minutes of the accident that you can interact with.
Penrose's Orch-OR theory). As the inventor puts it, "Source code is not time travel, it is time re-assignment". So they somehow capture this capability from the accident victim's brain and then link it in to another almost dead person's brain, creating some sort of bridge. We're probably well into fantasy territory by now, but that's nothing compared to what happens at the end of the film. I'll leave that to whatever imagination you may have left by then.
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