To be fair they forgot about Greatjon after season 1. He was top adviser man then before they went nah, actually Robb spends most of his time talking to Roose. I'm not sure he was even shown at the red wedding.
I am not too pleased with the north storyline but I suppose they've made too many changes from Davos staying at Castle Black, the total lack of Manderlys, Stannis' accelerated demise (if that even happens), to Sansa at Winterfell. And Brienne in the north. I'm glad they've at least expanded it to include other families since S4 and S5 was basically just Boltons left here.
I'm trying to remember if Qyburn ever referred to zombie mountain as Robert Strong in S5E10. I assume not since that would be a terrible continuity error within the show but there's been bad ones anyway. In any case, I don't know why they wouldn't incorporate that. It's not like the casual audience would have remembered his name, he's just the Mountain. What does it matter what the huge bloke is called? Eh whatever.
RIP Ser Alliser the cunt. That said I won't miss him spending all his screen time saying Jon let wildlings through the Wall.
Shame Janos got the honourable death of beheading but Alliser hanged though.
In the end, Jon's random turn is what many expected but they did a really shitty job explaining it. As in, not at all. Hoping for more clarity soon.
Also, WHERE THE FUCK IS BAELISH