My guess re: the raining fish is that we eventually get a flashback explaining that a truck full of live fish got hit by the blizzard or something. They foreshadowed this with the live fish in the tank at the start of the episode, letting us know that the restaurant has to be getting shipments of live fish from somewhere.
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Very interesting his decision to frame the brother and even put a gun in the son's bag.
I think this actually makes a lot of sense. His brother had just come to see him in the hospital and told him that he wouldn't help him and that he had always been a burden to him. When you consider that he killed his wife for what he perceived as constantly demeaning him, it's not too far to say he'd get his brother thrown in jail for 'abandoning' him.
[This message has been edited by DanHo2010 (edited 5/21/2014 9:48a).]