There isn't a controversy surrounding the penalty, by the current rules it's a clear penalty, that bit can't really be argued, and none of the people who spoke about it tonight said otherwise (well maybe Dyche, but I never understand his stupid riddles, so who knows ?).
The only controversy is with the rules, if a shot hits an arm a yard away, when there was clearly no intention to handball, just block, should it be handball ? The problem is, in one game it's given, and in another it isn't. The referee tonight didn't give it (don't think he saw it), but the linesman did, and indicated with his flag "penalty", don't know if var got involved to check, that wasn't made clear on the coverage I watched.