Not talking about the character, just his backstory. In terms of the TV show, I think he'd be a stronger character and more menacing if he was completely mysterious.
Night's King already has a backstory. And I doubt the show will go much into it. Maybe a mention but I don't see them delving in too deep. It's pretty irrelevant to the whole story.
The last few seasons or so I've grown extremely tired with Daenyrs and her storyline. But I loved her scenes and dialogue with Tyrion. Now I actually want to see more of her. I think her storyline is about to get a whole lore more interesting.
I don't see why teams would practice 2-point conversions. They already practice goal line offense which is exactly what a 2-point conversion is. I think teams will still kick the extra point at the same rate as now.
This is why I hated the fact Joffrey got killed off. He was a great villain to the story and way more interesting than Cersei. He was way more unpredictable. Imagine Joffrey was still alive and he went to war against the Faith Militant for what they did. He started slaughtering those of the Faith and started turning the entire city of Kings Landing against him. Finally the people were starting to stand up against this tyrant and for the first time making Joffreys reign completely vulnerable for attack by one of the other people who are laying claim to the throne. I think the story would be a lot more interesting.
The silver spray was just spray paint. They said in the movie when they would enter Valhalla they would have chrome skin. I think it was just their crazy ass way of preparing themselves to be chrome.
I saw it in 3D and I actually thought it brought out a lot of the visuals. It gave that sense of depth and made the visuals seem layered. But I guess it just comes down to personal preference.