Go back through my chapter-by-chapter essays and check out the “Book vs. Show” sections. There’s a lot of stuff, from the larger scale (aging up the kids, for example) to the smaller scale (Tyrion’s one-two-three) that was done well.
That’s always been my thing with the show: if it was all one thing or all the other, no one would complain because either the show would be perfection or such a disaster that people wouldn’t expect anything more. But the show veers so wildly between the two that it confounds people regularly.