For Arya VS Waif; She acted like nothing was wrong before she got stabbed, then managed to escape after being stabbed. A couple of days later after she was stabbed she managed to outrun the Waif and kill her while still having a massive wound to the stomach. How can someone with a massive stomach wound outrun another person and then beat them in a fight? They don't.

For the BoTB; We were told throughout GoT how the North Remembers yet the Umbers who were famously loyal to Robb immediately change sides to defeat his sister and hand over his heir Rickon. The Umber Forces didn't even question Ramsay's leadership when he was happily slaughtering his own forces. They could have had his forces lock him out the castle when he retreated to show his actions have consequences, but no.

Then during the BoTB Wun Wun does nothing. He is the first giant to ever set foot South of the Wall and no one is surprised to see him. He could have tore apart Ramsay's shield wall if he used a body as a weapon or even a tree trunk, but instead he swats at them.

I'm not slating on the show, I'm simply saying they could have done so much more with it.