“Source Code” is not just good science fiction, it’s also a good movie. This has been a solid season for movies with sci-fi-like concepts that did not rely heavily on special effects. “The Adjustment Bureau” was a solid film. “Limitless” may not have been as bright as its main character, but it was a fun ride throughout, and even if I wanted to complain about the Hollywood ending, I have to admit that sometimes it’s nice to see the good guys win. I’m not going to tell you who wins in “Source Code,” but needless to say, if you’ve seen the previews and the commercials, you’ve only started to unravel the layers of this movie.