NHL Network had the proper take on it, essentially the blue crease is the goalies and you cant literally camp out there, which shaw did. he made no effort to get out of the crease when the puck wasnt there. it was a bordeline call but the missed call on the franzen hit was too. i say it was all fair in playoff hockey.
I am a Detroit fan from Chicago, and I have the lovely perspective of being the away fan at the UC vs my dad being hte away fan at JLA.
As for your questions 1 and 2 I don't know about
3. There was some representation for the blackhawks when I went to the sellout finale last year. So you won't be the only hawks fans there as the Hawks travel well. The people who don't do well in opposing barns are the ones that overtly talk smack to other people and ignore the fact they are surrounded by people who don't like who they are rooting for. It is just a recipe for disaster. You simply just need to be respectful, the fact you came here to even check means you likely are miles ahead of these people.
As far as the experiences between the two, JLA is a million times better than the UC for an away fan. I have been to a wings game every year at the UC for many years. I can't count a single time where I didn't get one of: middle finger shoved in my face, yelled into my face, threatened to have beer thrown on me, or just general callous comments towards me. Now they aren't all combined at once, but still all happen. Luckily I am with my dad and my brother typically (im 27 now) who are Blackhawks fans. They are a buffer but walk alone down the hallways and things dont go well. This also isn't to say there aren't good blackhawks fans... I know plenty, but there are people who go out of their way to show their hatred for the Detroit red wings to the away fans.
At JLA my dad came and the wings fans were generally nice to cordial to my dad. None of the above was even hinted at towards him. My dad didn't do anything outrageous besides the cheering and the random remark so I think you'll be ok. His comment to me was "I kind of feel bad because they treat you so badly at the UC compared to how I'm being treated here". So take what my experience is for what its worth.