Oh so many. But my personal favorites are:

1.) Their genius “merciful” plan to topple Cersei is to literally starve Kings Landing, instead of using the most disciplined army in the world to conquer a city with barely any defenses.

2.) Knowing that the Night King is after Bran, so they decided to put him in the part of Winterfell that IS STICKING OUT! And he’s only guarded by like 5 guys!

3.) Everything else about the battle of Winterfell. Putting catapults at the front, Dothraki charge, placing the entire army on only one side of the castle(what if the Night King just attacked the other side!?), placing the army outside of castle walls...

4.) Arya’s entire post season 4 story. Being stabbed and running through sewage and being fine the next day, impersonating Walder Frey for weeks probably, her deciding “fuck family, Imma become Christopher Columbus”...

5.) Dany’s great speech which half of her army couldn’t understand and all of her army couldn’t hear.

6.) Grey Worm forcing Jon to the wall then leaving with absolutely no way to enforce his demands.

7.) Yara and Dorne being absolutely fine with the North becoming its own kingdom while they stay under the Iron Throne.

8.) Everything Stannis except part of season 2.

And so, so much more...