A modern-day Tom Sawyer and Huck Finn run away from home and into a Colorado version of the opening to “Goodfellas” in “Cop Car” (2015). The best way to describe the movie would be “oddly fascinating.” Kevin Bacon’s Rocky Mountain copstache sure is. The first half of the movie almost seems like it ought to be nominated for Best Short Film. It’s like the end of “My Own Private Idaho,” except it’s not in Idaho. And it doesn’t suck. Then the fun starts. And by fun, I mean, “not fun.” At least not for Tom and Huck. Lesson: don’t steal.