Unnecessary violence
The kidnapping of the wife was extremely stupidly and poorly arranged. I can't believe this 'nice familyman' put his wife through that.
The CORRECT way to do it, _of_course_, would've been for him to drug his wife with some kind of powerful, but harmless sleeping pill or substance that has a similar effect, then go to his office, and then the thugs would come, break the door (or come in with key but make it look like forced entry), grab the sleeping wife, keep her asleep for the whole duration, etc.
There was _absolutely_ no need for the whole thing to be so loud, so messy, so traumatic for the wife, so suspicious (noises like BREAKING GLASS sound would echo around that neighbourhood in that kind of weather pretty far, and her screams would come out because they stupidly broke the glass - plus, would the husband REALLY want his house's glass broken - it's cumbersome and expensive to have it fixed, and in the winter, that house is unlivable now because of the cold (sure, you can insulate it somehow but it's still a big inconvenience and nuisance)).
A sleeping wife in the trunk, no guns anywhere, would make the 'police inspection' scene also go through smoothly and without problems.
Any dumb thug should have been able to figure out all this, so this whole unnecessary violence kind of makes this whole movie unbelievable.
By the way, where was their home located? It looks like a gorgeous neighbourhood, but when I look for the 'filming locations of Fargo', I never find anything about their home - it even seems to be standing on some kind of hill because the view is so nice (when the wife is watching TV just around the time of the kidnappers starting to spring to action, when you look outside, behind the masked kidnapper just before he breaks the window, that's a pretty beautiful view to a nice-looking neighbourhood).