I have watched this movie yesterday but I have noticed some that might other people also noticed
1-In the seen in which jhon wick came to ruska Roma and the director and jhon wick talk about the assassin of puppy on the stairs according to my memory the scenerio of the puppy finished in the start of jhon wick chapter 2 .In chapter 3 when he came to ruska roma he had a ticket and he was an excomunicado.and I think there is no need to talk about puppy
2- In jhon wick 3 when the director made a kind of stamp on jhon wick back after that the member of the high table (the adjudicator) put the knife in the hands of the director for helping jhon wick in ballerina you don't show any type of bandage or something on director hands.
3-you need to compare the voice of keanu Reeves in jhon wick and ballerina you add more base in keanu Reeves voice in ballerina.
If you want to make more chapter of ballerina then it's not seems good instead you need to add Anna de armas in jhon wick chapter 5 which make the movie fantastic because ballerina is not be able to take the level and glamour of jhon wick but at the end the acting of anna de armas was fabulous .