No we didn't get away with anything! Sorry to be pedantic but I don't understand why you keep skipping the bit where a penalty shouldn't have ever been rewarded, so anything beyond that becomes pretty meaningless, in terms of the realms of "fairness" and "should'ves/shouldn't'ves".
I'll stop...
It was a Newcastle penalty, taken by Ritchie. For quite a while there was speculation that he had accidentally touched the ball with his planted foot, and that it was disallowed for that. But eventually the ref assocation came out and apologised that it was a misunderstanding of the rules.
The piss-poor officiating was giving the penalty in the first place! Don't really give a shit about what happened beyond that, as justice was eventually served. You wouldn't be going apeshit if you never should've been given the penalty, surely? You'd be feeling very cheeky.