This could be a plot device: When Ben Garvey wakes from the dream of his father's suicide, In three different shots, he and Lisa alternate from left to right side of the bed. Additionally, Ben is looking at the same injury on alternate hands.
Near the end of the movie when Ben is taking the red Ford pickup, he puts his right hand on the shifter (which is in the Park position). At that moment the sound of the engine starting is heard. The ignition switch on that model is on the lower dashboard to the right of the steering column, which would have been impossible for him to reach with either hand at that moment.