These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fridge Logic: At the end of the movie, Ruben has still essentially gotten away with murder.
Double jeopardy only means that he can't be tried again after a legitimate "not guilty" verdict - and even if the verdict is upheld, it's likely he'll find his stay in prison greatly extended once his involvement in Nash's jailbreak comes to light.