+4
First time two black nominees won Best Supporting awards in the same ceremony; in general, first time an Oscar ceremony featured more than 3 black winners
First time in almost twenty years that all acting winners are American
First time in 10 years that the Best Actor nominee who won the SAG did not win the Oscar (Washington/Affleck)
First time a Muslim actor won an Oscar (Ali)
First time in almost 20 years that all acting awards went to people playing fictional people
First time a movie with 14 nominations failed to win Best Picture
First time a Potter movie won an Academy Award
First time a DC Universe movie won an Academy Award
First time a living person was included in the "In Memoriam" Segment
First time Kevin O'Connell won an Oscar after 21 nominations (Hacksaw Ridge, Sound Mixing)
First time the wrong Best Picture winner was announced
First time Netflix (White Helmets) and Amazon (Manchester By the Sea) films won Oscars
-Reddit