The buildings and structures look FAR too anachronistic
They're made of wood, yes, but they're glossed over black and god knows what, and I sincerely doubt that castles, buildings and structures set in that time were like the ones portrayed here.
Well, there's a review from Shadiversity about Outlaw King, concluding that it's the most accurate middle age movie he has seen... and still the castles were wrong.
https://www.youtube.com/watch?v=AEoC9G75nwo