Some of us are old enough to remember black-and-white reruns of “The Twilight Zone,” the show that set the standard for twisting our perceptions of reality. If it were still around today, “Source Code” (2011) could be an episode of that TV series. Here’s the plot: Assuming that when people die, the last few moments of their life remain in their memory as their brain slowly shuts down; what if someone else could occupy that memory space and find clues to solve a crime? Cool, huh? Or too complex? Maybe that’s why it didn’t do better at the box office.