Interestingly the Thing was on ITV last night and I ended up watching bits of it!
I think what's great is that you never know who the Thing is. The bit with Nauls/Childs and Garry on the sofa is great because you just know one of them is the Thing...and then none of them is! Similarly the fact that Norris has a heart attack surely means he can't be the Thing but he is! Copied him perfectly, even down to a heart defect.