From my perspective, the state trooper at the end of the film, is the long lost daughter of the couple Owen Wilson's character was staying with. Although we are made to believe that she is dead, I think the reason her mother was murdered and her father blamed for the crime, was that she either did it, or hired Owen Wilson to do it. When they are both driving away at the end of the film and the trooper flashes her light in Owen Wilson's car, she smiles. Viewers may just chalk this up to her recognizing him from earlier in the movie when she found him at the side of the road. But I believe that the arrow sign flashing on the highway in either direction <->, is meant to ask the viewer who they believe the true muderer is, the state trooper or Owen Wilson ? Or maybe even that both of them are similar in nature and therefore connected.
Review of The Minus Man
