So many questions: why is Leonardo DiCaprio nominated for lead actor and Brad Pitt for supporting actor for “Once Upon a Time in Hollywood”?; why wasn't Robert DeNiro nominated for "The Irishman"?; why is Tom Hanks a supporting actor for “A Beautiful Day in the Neighborhood”?; and how rare are Scarlett Johansson's nominations for both lead (“Marriage Story”)

and supporting actress ("Jojo Rabbit")?