Read that LMM was given the option to have the spitting CGI'd out, but he wanted to keep it in to show how the King sang.
Saw it once in the theater, and multiple times on Disney+ (my wife, like others in here
, has become a bit of a fanatic, listening to the soundtrack constantly.
The King is my favorite character, I love the little things they do with him, like the stomp and change of the lights to blue in his first songs, and him dancing happily around when all is going poorly towards the end.
I loved the way they filmed the show. I read that they filmed one live show, then filmed it again on a day off without a crowd so cameras would not interfere with people sight-lines. I hope to see more musicals filmed this way in the future.
On a separate note, some people have said that the format loses some of the perspective of the background with the other dancers and props. I go back and forth, both are important.