LOL. I don't think RJ had ever been anywhere near a real horse in his life. I'm all about the horse pedantry.
Almost no TV show or movie I can think of is any better (I can name like two novels which feel like they 'get' horses, written by horse people). They all get horses wrong. They basically treat them as furry cars and not 500kg flight animals with opinions and minds of their own, and a tendency to break and become very expensive and heartbreaking.
On another note, I wasn't in love with the Amazon adaptation but I am sad to see it go.